Cita APA (7a ed.)

Emerton, E. (1990). Correspondence of Pope Gregoy VII: Sellected letters from the registrum. Columbia University Press.

Cita Chicago Style (17a ed.)

Emerton, Ephraim. Correspondence of Pope Gregoy VII: Sellected Letters from the Registrum. New York: Columbia University Press, 1990.

Cita MLA (9a ed.)

Emerton, Ephraim. Correspondence of Pope Gregoy VII: Sellected Letters from the Registrum. Columbia University Press, 1990.