APA (7th ed.) Citation

Klopper, A., Genazzani, A. R., & Crosignani, P. G. (1980). The Human placenta: Proteins and hormones. Academic Press.

Chicago Style (17th ed.) Citation

Klopper, Arnold, Andrea R. Genazzani, and P. G. Crosignani. The Human Placenta: Proteins and Hormones. London ; New York: Academic Press, 1980.

MLA (9th ed.) Citation

Klopper, Arnold, et al. The Human Placenta: Proteins and Hormones. Academic Press, 1980.