Cita APA (7th ed.)
Erwin, E. (1970). The Concept of Meaninglessness. Johns Hopkins Press.
Cita Chicago (17th ed.)
Erwin, Edward. The Concept of Meaninglessness. Baltimore: Johns Hopkins Press, 1970.
Cita MLA (9th ed.)
Erwin, Edward. The Concept of Meaninglessness. Johns Hopkins Press, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.