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.
Citazione stile Chigago Style (17a edizione)Wishik, Samuel M., e 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.
Citatione MLA (9a ed.)Wishik, Samuel M., e Donald W. Helbig. The Fertility Pattern Method: Estimation of Fertility Change by Retrospective Quasi-cohort Analysis of Group Specific Fertility Patterns. Colombia University, 1972.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.