Cita APA (7th ed.)
Ferm, V. (1969). Basic philosophy for beginners. The Christopher Publishing House.
Cita Chicago (17th ed.)
Ferm, Vergilius. Basic Philosophy for Beginners. North Quincy, Mass.: The Christopher Publishing House, 1969.
Cita MLA (9th ed.)
Ferm, Vergilius. Basic Philosophy for Beginners. The Christopher Publishing House, 1969.
Atenció: Aquestes cites poden no estar 100% correctes.