APA

(1940). New sick call ritual. New York City: Wiliam J. Hirten CO.

Chicago

1940. New sick call ritual. New York City: Wiliam J. Hirten CO.

Harvard

(1940). New sick call ritual. New York City: Wiliam J. Hirten CO.

MLA

New sick call ritual. New York City: Wiliam J. Hirten CO. 1940.