APA-referens (7:e uppl.)

Cook, R. C., & Lecht, J. (1968). People!: An introduction to the study of population. Columbia Books.

Chicago-referens (17:e uppl.)

Cook, Robert C., och Jane Lecht. People!: An Introduction to the Study of Population. Washington: Columbia Books, 1968.

MLA-referens (9:e uppl.)

Cook, Robert C., och Jane Lecht. People!: An Introduction to the Study of Population. Columbia Books, 1968.