Lux veritatis. [Encycliek 25 dec. 1931].

MLA

Pius. Lux Veritatis. [encycliek 25 Dec. 1931]. Fribourg: St-Paul, 1958.

APA

Pius, P. (1958). Lux veritatis. [Encycliek 25 dec. 1931]. Fribourg: St-Paul.

Chicago

Pius Lux Veritatis. [encycliek 25 Dec. 1931]. Fribourg: St-Paul, 1958.