APA

Bacon R., . (1928). The opus majus. Philadelphia: University of Pennsilvania.

Chicago

Bacon Roger, . 1928. The opus majus. Philadelphia: University of Pennsilvania.

Harvard

Bacon R., . (1928). The opus majus. Philadelphia: University of Pennsilvania.

MLA

Bacon Roger, . The opus majus. Philadelphia: University of Pennsilvania. 1928.