Ingruentium malorum. [Encycliek 15 sept. 1951].

MLA

Pius. Ingruentium Malorum. [encycliek 15 Sept. 1951]. Fribourg: Ed. St-Paul, 1958.

APA

Pius, P. (1958). Ingruentium malorum. [Encycliek 15 sept. 1951]. Fribourg: Ed. St-Paul.

Chicago

Pius Ingruentium Malorum. [encycliek 15 Sept. 1951]. Fribourg: Ed. St-Paul, 1958.