Gaya APA

Heath, R, G. (1976). Crux imperatorum philosophia: Imperial horizons of the Cluniac confraternitas, 964-1109. . Pittsburgh: Pickwick Press.

Gaya MLA

Heath, Robert, G.. "Crux imperatorum philosophia: Imperial horizons of the Cluniac confraternitas, 964-1109. ". Pittsburgh: Pickwick Press, 1976. Buku.