APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

Cook, Robert C., et al. Population!: An Introduction to the Study of Population. Columbia Books, 1968.