APA

Gula R. M., . (1989). Foundations of catholic morality. New York: Paulist Press.

Chicago

Gula Richard M, . 1989. Foundations of catholic morality. New York: Paulist Press.

Harvard

Gula R. M., . (1989). Foundations of catholic morality. New York: Paulist Press.

MLA

Gula Richard M, . Foundations of catholic morality. New York: Paulist Press. 1989.