Gregorian Chant

MLA

Apel, Willi, R Jesson, and Robert J Snow. Gregorian Chant. Bloomington, IN: Indiana University Press, 1958.

APA

Apel, W., Jesson, R., & Snow, R. J. (1958). Gregorian Chant. Bloomington, IN: Indiana University Press.

Chicago

Apel, Willi, R Jesson, and Robert J Snow. Gregorian Chant. Bloomington, IN: Indiana University Press, 1958.