APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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