Wishik, S. M., & Helbig, D. W. (1972). The fertility pattern method: Estimation of fertility change by retrospective quasi-cohort analysis of group specific fertility patterns. Colombia University.
Chicago Style (17th ed.) CitationWishik, Samuel M., and Donald W. Helbig. The Fertility Pattern Method: Estimation of Fertility Change by Retrospective Quasi-cohort Analysis of Group Specific Fertility Patterns. New York: Colombia University, 1972.
MLA (9th ed.) CitationWishik, Samuel M., and Donald W. Helbig. The Fertility Pattern Method: Estimation of Fertility Change by Retrospective Quasi-cohort Analysis of Group Specific Fertility Patterns. Colombia University, 1972.
Warning: These citations may not always be 100% accurate.