Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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