Gaya APA

Ullmann, W. (1949). Medieval papalism, the political theories of the medieval canonists. The Maitland memorial lectures, Cambridge 1948. . London: Methuen.

Gaya MLA

Ullmann, W.. "Medieval papalism, the political theories of the medieval canonists. The Maitland memorial lectures, Cambridge 1948. ". London: Methuen, 1949. Buku.