APA

FERM V., . (1950). A history of philosophical systems. New York: The Philosophical Library.

Chicago

FERM Vergilius, . 1950. A history of philosophical systems. New York: The Philosophical Library.

Harvard

FERM V., . (1950). A history of philosophical systems. New York: The Philosophical Library.

MLA

FERM Vergilius, . A history of philosophical systems. New York: The Philosophical Library. 1950.