APA (7th ed.) Citation

Ybáñez, C. (1931). Directorium Missionariorum (3a ed.). [s.n.].

Chicago Style (17th ed.) Citation

Ybáñez, Coelestinus. Directorium Missionariorum. 3a ed. Romae: [s.n.], 1931.

MLA (9th ed.) Citation

Ybáñez, Coelestinus. Directorium Missionariorum. 3a ed. [s.n.], 1931.