1. Baum, F., & Cope, D. R. Some characteristics of intentionally childless wives in Britain. Journal of Biosocial Science, 1980, 12, 287–299.
2. Bellman, P. Vasectomy and childless men. Unpublished manuscipt, Reed College, 1974.
3. Benson, D. E., & Hoover, W. The stigmatization of intentionally child less couples. Unpublished manuscript, Kent State University, 1978.
4. Blake, J. Is zero preferred? American attitudes toward childlessness in the 1970’s. Journal of Marriage and the Family, 1979, 41, 245–257.
5. Blake, J., & Davis, K. Population and public opinion: The need for basic research. American Behavioral Scientist, 1963, 5, 24–29.