Lijeros, F., C. R. Edling, L. A. N. Amaral, H. E. Stanley, and Y. Åberg. 2001. The Web of Human Sexual Contacts. Nature 411: 907–908.
Linzenmeier, G. 1947. Zur Frage der Empfängniszeit der Frau: Hat Knaus oder Stieve recht? Zentralbl Gynäkol 69: 1108–1110.
Lloyd, J., N. S. Crouch, C. L. Minto, L.-M. Liao, and S. M. Creighton. 2005. Female Genital Appearance: “Normality” Unfolds. Brit J Obstet Gynaecol 112: 643–646.
Lönnerdal, B. 2000. Breast Milk: A Truly Functional Food. Nutrition 16: 509–511.
Lopata, A. 1996. Implantation of the Human Embryo. Hum Reprod 11 (Suppl. 1): 175–184.
Loucks, A. B., and L. M. Redman. 2004. The Efect of Stress on Menstrual Function. Trends Endocrinol Metab 15: 466–471.
Loudon, A. S. I., A. S. McNeilly, and J. A. Milne. 1983. Nutrition and Lactational Control of Fertility in Red Deer. Nature 302: 145–147.
Loy, J. 1987. The Sexual Behavior of African Monkeys and the Question of Estrus. In Comparative Behavior of African Monkeys, ed. E. Zucker, 175–195. New York: Alan Liss.
Luckett, W. P. 1974. The Comparative Development and Evolution of the Placenta in Primates. Contrib Primatol 3: 142–234.
MacDorman, M. F., F. Menacker, and E. Declercq. 2008. Cesarean Birth in the United States: Epidemiology, Trends, and Outcomes. Clin Perinatol 35: 293–307.
MacLeod, J., and R. Z. Gold. 1951. The Male Factor in Fertility and Infertility. II. Spermatozoon Counts in 1000 Men of Known Fertility and 1000 Cases of Infertile Marriage. J Urol 66: 436–449.
______. 1957. The Male Factor in Fertility and Infertility. IX. Semen Quality in Relation to Accidents of Pregnancy. Fertil Steril 8: 36–49.
MacLeod, J., and R. S. Hotchkiss. 1941. The Efect of Hyperpyrexia upon Spermatozoa Counts in Men. Endocrinology 28: 780–784.
MacLeod, J., and Y. Wang. 1979. Male Fertility Potential in Terms of Semen Quality. A Review of the Past, a Study of the Present. Fertil Steril 31: 103–116.
Macomber, D., and M. B. Sanders. 1929. The Spermatozoa Count. N Engl J Med 200: 981–984.
Málek, J., J. Gleich, and V. Maly. 1962. Characteristics of the Daily Rhythm of Menstruation and Labor. Ann NY Acad Sci 98: 1042–1055.
Mancuso, P. J., J. M. Alexander, D. D. McIntire, E. Davis, G. Burke, and K. J. Leveno. 2004. Timing of Birth After Spontaneous Onset of Labor. Obstet Gyn-aecol 103: 653–656.
Mann, D. R., and H. M. Fraser. 1996. The Neonatal Period: A Critical Interval in Male Primate Development. J Endocrinol 149: 191–197.
Marshall, J. 1968. Congenital Defects and the Age of Spermatozoa. Int J Fertil 13: 110–120.
Martin, R. D. 1968. Reproduction and Ontogeny in Tree-Shrews (Tupaia be-langeri) with Reference to Their General Behaviour and Taxonomic Relationships. Z Tierpsychol 25: 409–532.
______. 1969. The Evolution of Reproductive Mechanisms in Primates. J Reprod Fertil Suppl 6: 49–66.
______. 1981. Relative Brain Size and Metabolic Rate in Terrestrial Vertebrates. Nature 293: 57–60.
______. 1984. Scaling Efects and Adaptive Strategies in Mammalian Lactation.
Symp Zool Soc Lond 51: 87–117.
______. 1992. Female Cycles in Relation to Paternity in Primate Societies. In Paternity in Primates: Genetic Tests and Theories. Implications of Human DNA Fingerprinting, ed. R. D. Martin, A. F. Dixson, and E. J. Wickings, 238–274. Basel: Karger.
______. 1996. Scaling of the Mammalian Brain: The Maternal Energy Hypothesis. News Physiol Sci 11: 149–156.
______. 2003. Human Reproduction: A Comparative Background for Medical Hypotheses. J Reprod Immunol 59: 111–135.
______. 2007. The Evolution of Human Reproduction: A Primatological Perspec-tive. Yearb Phys Anthropol 50: 59–84.
______. 2008. Evolution of Placentation in Primates: Implications of Mammalian Phylogeny. Evol Biol 35: 125–145.
______. 2012. Primer: Primates. Curr Biol 22: R785–R790.
Martin, R. D., and K. Isler. 2010. The Maternal Energy Hypothesis of Brain Evolution: An Update. In The Human Brain Evolving: Paleoneurological Studies in Honor of Ralph L. Holloway, ed. D. Broadfield, M. Yuan, K. Schick, and N. Toth, 15–35. Bloomington, IN: Stone Age Institute Press.
Martin, R. D., and A. M. MacLarnon. 1985. Gestation Period, Neonatal Size and Maternal Investment in Placental Mammals. Nature 313: 220–223.
______. 1988. Comparative Quantitative Studies of Growth and Reproduction. Symp Zool Soc Lond 60: 39–80.
Martin, R. D., L. A. Willner, and A. Dettling. 1994. The Evolution of Sexual Size Dimorphism in Primates. In The Dif erences Between the Sexes, ed. R. V. Short and E. Balaban, 159–200. Cambridge: Cambridge University Press.
Matsuda, S., and H. Kahyo. 1992. Seasonality of Preterm Births in Japan. Int J Epidemiol 21: 91–100.
McCance, R. A., M. C. Luf, and E. E. Widdowson. 1937. Physical and Emotional Periodicity in Women. J Hygiene 37: 571–611.
McCoy, S. J. B., J. M. Beal, S. B. M. Shipman, M. E. Payton, and G. H. Watson. 2006. Risk Factors for Postpartum Depression: A Retrospective Investigation at 4-Weeks Postnatal and a Review of the Literature. J Am Osteopath Assoc 106: 193–198.
McGrath, J. J., A. G. Barnett, and D. W. Eyles. 2005. The Association Between Birth Weight, Season of Birth and Latitude. Ann Hum Biol 32: 547–559.
McKenna, J. J., H. L. Ball, and L. T. Gettler. 2007. Mother-Infant Cosleeping, Breastfeeding and Sudden Infant Death Syndrome: What Biological Anthropology Has Discovered About Normal Infant Sleep and Pediatric Sleep Medicine. Yearb Phys Anthropol 45: 133–161.
McKeown, T., and J. R. Gibson. 1951. Observations on All Births (23,970) in Birmingham, 1947. II: Birth Weight. Brit J Soc Med 5: 98–112.
______. 1952. Period of Gestation. Brit Med J 1: 938–941.
McKeown, T., and R. G. Record. 1952. Observations on Foetal Growth in Multiple Pregnancy in Man. J Endocrinol 8: 386–401.
McNeilly, A. S. 2001. Lactational Control of Reproduction. Reprod Fert Dev 13: 583–590.
McTiernan, A., and D. B. Thomas. 1986. Evidence for a Protective Efect of Lactation on Risk of Breast Cancer in Young Women. Results from a Case Control Study. Am J Epidemiol 124: 353–358.
Menacker, F., and B. E. Hamilton. 2010. Recent Trends in Cesarean Delivery in the United States. NCHS Data Brief 35: 1–8.
