APA (7th ed.) Citation

Schwarz, O. (1949). The psychology of sex / by Oswald Schwarz. Penguin.

Chicago Style (17th ed.) Citation

Schwarz, Oswald. The Psychology of Sex / by Oswald Schwarz. Penguin, 1949.

MLA (9th ed.) Citation

Schwarz, Oswald. The Psychology of Sex / by Oswald Schwarz. Penguin, 1949.

Warning: These citations may not always be 100% accurate.