APA (7th ed.) Citation

De Beauvoir, S., & Green, P. (1965). The Prime of life. Penguin Books.

Chicago Style (17th ed.) Citation

De Beauvoir, Simone, and Peter Green. The Prime of Life. England: Penguin Books, 1965.

MLA (9th ed.) Citation

De Beauvoir, Simone, and Peter Green. The Prime of Life. Penguin Books, 1965.