Quas primas. [Encycliek 11 dec. 1925].

MLA

Pius. Quas Primas. [encycliek 11 Dec. 1925]. Fribourg: St-Paul, 1958.

APA

Pius, P. (1958). Quas primas. [Encycliek 11 dec. 1925]. Fribourg: St-Paul.

Chicago

Pius Quas Primas. [encycliek 11 Dec. 1925]. Fribourg: St-Paul, 1958.