Rerum omnium. [Encycliek 26 jan. 1923].

MLA

Pius. Rerum Omnium. [encycliek 26 Jan. 1923]. Fribourg: St-Paul, 1958.

APA

Pius, P. (1958). Rerum omnium. [Encycliek 26 jan. 1923]. Fribourg: St-Paul.

Chicago

Pius Rerum Omnium. [encycliek 26 Jan. 1923]. Fribourg: St-Paul, 1958.