APA

Waitz S., . (1936). The greatest calling. Milwaukee: The Bruce Pub. Company.

Chicago

Waitz S, . 1936. The greatest calling. Milwaukee: The Bruce Pub. Company.

Harvard

Waitz S., . (1936). The greatest calling. Milwaukee: The Bruce Pub. Company.

MLA

Waitz S, . The greatest calling. Milwaukee: The Bruce Pub. Company. 1936.