APA

Burch G. B., . (1951). Early medieval philosophy. New York: Columbia University Press.

Chicago

Burch George Bosworth, . 1951. Early medieval philosophy. New York: Columbia University Press.

Harvard

Burch G. B., . (1951). Early medieval philosophy. New York: Columbia University Press.

MLA

Burch George Bosworth, . Early medieval philosophy. New York: Columbia University Press. 1951.