Gaya APA

Boff, L. (2011). Virtues: For another possible world. Translated by Alexandre Guilherme. : Virtudes para um outro mundo possivel. 1946 . Eugene: Eugene Cascade Books.

Gaya MLA

Boff, Leonardo. "Virtues: For another possible world. Translated by Alexandre Guilherme. : Virtudes para um outro mundo possivel. 1946 ". Eugene: Eugene Cascade Books, 2011. Buku.