APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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