Berman, M.L., Hanson, K. & Hellman, I.L. (1972) Effect of breast-feeding on post-partum menstruation, ovulation and pregnancy in Alaskan Eskimos. Am. J. Obstet. Gynec. 114, 524.
Bonte, M. & van Balen, H. (1969) Prolonged lactation and family spacing in Rwanda. J. biosoc. Sci. 1, 97.
Buchanan, R. (1975) Breast-feeding—an Aid to Infant Health and Fertility Control. Population Reports, Series J, No. 4. George Washington University Medical Center, Washington, DC.
Cantrelle, P. & Leridon, H. (1971) Breastfeeding, mortality in childhood and fertility in a rural zone of Senegal. Popul. Stud. 25, 505.
Chen, L., Ahmed, S., Gesche, M. & Mosley, W. (1974) A prospective study of birth interval dynamics in rural Bangladesh. Popul. Stud. 28, 277.
Chowdhury, A., Khan, A. & Chen, L. (1976) The effect of child mortality experience on subsequent fertility in Pakistan and Bangladesh. Popul. Stud. 30, 2.
Crosignani, P.G. & Robyn, C. (Eds) (1977) Prolactin and Human Reproduction. Academic Press, New York.
Jain, A.K. (1969) Pregnancy outcome and the time required for the next conception. Popul. Stud. 23, 69.
Jain, A., Hsu, T., Freedman, R. & Chang, M. (1970) Demographic aspects of lactation and post-partum amenorrhoea. Demography, 7, 255.
Kamal, I., Hefnawi, F., Ghoneim, M., Talaat, M., Younis, N., Tagui, A. & Abdalla, M. (1969) Clinical, biochemical and experimental studies on lactation. I. Lactation pattern in Egyptian women. Am. J. Obstet. Gynec. 105, 314.
Kang, K.W., Hong, J.W. & Cho, K.S. (1973) A Study of the Inter-relationships between Lactation and Postpartum Amenorrhoea. Korean Institute for Family Planning, Seoul.
Kann, G., Martinet, J. & Schirar, A. (1977) Modifications of gonadotrophin secretion during natural and artificial hyperprolactinaemia in the ewe. In: Prolactin and Human Reproduction. Edited by Crosignani, P. G. & Robyn, C., Academic Press, London.
Kwon, E., Kang, K., Hong, J., Park, C., Yun, B. & Whang, K. (1972) A Study on the Interrelationships Between Postpartum Family Planning and Maternity Care. College of Medicine, Seoul National University, Seoul, South Korea.
Leridon, H. (1975) Biostatistics of human reproduction. In: Measuring the Effect of Family Planning Programmes on Fertility. Edited by Chandrasekaran, C. and Hermalin, A.. Ordina Editions, Belgium.
Martin, W., Morley, D. & Woodland, M. (1964) Intervals between births in a Nigerian village. J. trop. Pediat. 10, 82.
Osteria, T. (1973) The effects of contraception upon lactation. Analysis of urban data. Cited by Buchanan (1975).
Perez, A., Vela, P., Potter, R. & Masnick, G.S. (1971) Timing and sequence of resuming ovulation and menstruation after childbirth. Popul. Stud. 25, 491.
Potter, R.G. (1963) Birth intervals: structure and change. Popul. Stud. 17, 155.
Potter, R.G., New, M., Wyon, J. & Gordon, J. (1965) Applications of field studies to research on the physiology of human reproduction. In: Public Health and Population Change. Edited by Sheps, M. and Ridley, J.. University of Pittsburgh Press.
Rolland, R., Lequin, R., Schellekens, L. & De Jong, F. (1975) The role of prolactin in the restoration of ovarian function during the early post-partum period in the human female. I. A study during physiological lactation. Clin. Endocr. 4, 15.
Rosa, F. (1975) Breast-feeding in Family Planning. Protein-Calorie Advisory Group of the United Nations System (PAG) Bulletin, Vol. 5 No. 3. United Nations, New York.
Singarimbun, M. & Manning, C. (1976) Breastfeeding, amenorrhoea and abstinence in a Javanese village: a case study in Mojolama. Stud. Fam. Plann. 7, No. 6.
Thomson, A., Hytten, F.E. & Black, A.E. (1975) Lactation and reproduction. Bull. WldHlth Org. 52, 337.
Van Ginneken, J. (1974) Prolonged breastfeeding as a birth spacing method. Stud. Fam. Plann. 5, 201; J. envir. Child Hlth, 21, 59.
Vis, H., Bossuyt, M., Hennart, P. & Carrael, M. (1975) The health of mother and child in rural Central Africa. Stud. Fam. Plann. 6, No. 12.
Wyon, J.B. & Gordon, J.E. (1971) The Khanna Study: Population Problems in the Rural Punjab. Harvard University Press, Cambridge, Mass.