APA (7th ed.) Citation

Petersen, A. (1939). Socialism: The world of tomorrow. New York labor news company.

Chicago Style (17th ed.) Citation

Petersen, Arnold. Socialism: The World of Tomorrow. New York: New York labor news company, 1939.

MLA (9th ed.) Citation

Petersen, Arnold. Socialism: The World of Tomorrow. New York labor news company, 1939.

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