APA (7th ed.) Citation

Ferm, V. (1950). A history of philosophical systems. Philosophical Library.

Chicago Style (17th ed.) Citation

Ferm, Vergilius. A History of Philosophical Systems. New York: Philosophical Library, 1950.

MLA (9th ed.) Citation

Ferm, Vergilius. A History of Philosophical Systems. Philosophical Library, 1950.

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