APA-referens (7:e uppl.)

Sikora, J. J. (1968). Calling: A reappraisal of religious life. Herder and Herder.

Chicago-referens (17:e uppl.)

Sikora, Joseph John. Calling: A Reappraisal of Religious Life. [New York]: Herder and Herder, 1968.

MLA-referens (8:e uppl.)

Sikora, Joseph John. Calling: A Reappraisal of Religious Life. Herder and Herder, 1968.