Cita APA (7a ed.)

Helm, P. (1973). The varieties of belief. Allen and Unwin; Humanities Press.

Cita Chicago Style (17a ed.)

Helm, Paul. The Varieties of Belief. London, New York: Allen and Unwin; Humanities Press, 1973.

Cita MLA (8a ed.)

Helm, Paul. The Varieties of Belief. Allen and Unwin; Humanities Press, 1973.