APA (7th ed.) Citation

Selsam, H. (1939). What is philosophy? International Publishers.

Chicago Style (17th ed.) Citation

Selsam, Howard. What Is Philosophy? New York: International Publishers, 1939.

MLA (9th ed.) Citation

Selsam, Howard. What Is Philosophy? International Publishers, 1939.

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