Gaya APA

Ullmann, W. (1967). The origins of the great schism, a study in fourteenth-century ecclesiastical history, [repr.]. Tjet. pertama 1948. . [Hamden: Conn] Archon Books.

Gaya MLA

Ullmann, W.. "The origins of the great schism, a study in fourteenth-century ecclesiastical history, [repr.]. Tjet. pertama 1948. ". [Hamden: Conn] Archon Books, 1967. Buku.