Citazione Stile APA (7a Edizione)

van Hoorn, W., & Keilmann, N. (1997). Birth expectations and their use in fertility forecasting.

Citazione stile Chigago Style (17a edizione)

van Hoorn, Wim, e Nico Keilmann. Birth Expectations and Their Use in Fertility Forecasting. Luxembourg, 1997.

Citatione MLA (8a ed.)

van Hoorn, Wim, e Nico Keilmann. Birth Expectations and Their Use in Fertility Forecasting. 1997.