APA (7th ed.) Citation

Selsam, H. (1939). What is philosophy?: A Marxist introduction. International publishers.

Chicago Style (17th ed.) Citation

Selsam, Howard. What Is Philosophy?: A Marxist Introduction. New York: International publishers, 1939.

MLA (8th ed.) Citation

Selsam, Howard. What Is Philosophy?: A Marxist Introduction. International publishers, 1939.

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