APA-referens (7:e uppl.)

Weeks, J. R. (2012). An introduction to population (11th ed.). Wadsworth Cengage Learning.

Chicago-referens (17:e uppl.)

Weeks, John Robert. An Introduction to Population. 11th ed. Belmont, Calif: Wadsworth Cengage Learning, 2012.

MLA-referens (9:e uppl.)

Weeks, John Robert. An Introduction to Population. 11th ed. Wadsworth Cengage Learning, 2012.