APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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