Gaya APA

Schumacher, W. (1957). Spiritus and spiritualis: a study in the sermons of Saint Augustine. . Mundelein: Saint Mary of the Lake Seminary.

Gaya MLA

Schumacher, W.A.. "Spiritus and spiritualis: a study in the sermons of Saint Augustine. ". Mundelein: Saint Mary of the Lake Seminary, 1957. Buku.