Sempiterne Rex. [Encycliek 8 sept. 1951].

MLA

Pius. Sempiterne Rex. [encycliek 8 Sept. 1951]. Fribourg: St-Paul, 1958.

APA

Pius, P. (1958). Sempiterne Rex. [Encycliek 8 sept. 1951]. Fribourg: St-Paul.

Chicago

Pius Sempiterne Rex. [encycliek 8 Sept. 1951]. Fribourg: St-Paul, 1958.