Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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