APA (7e ed.) Bronvermelding

Johner, D., & Butterfield, H. S. (1906). A new school of Gregorian chant. Fr. Pustet.

Chicago (17e ed.) Bronvermelding

Johner, Dominicus, en Henry S. Butterfield. A New School of Gregorian Chant. Ratisbon: Fr. Pustet, 1906.

MLA (8e ed.) Bronvermelding

Johner, Dominicus, en Henry S. Butterfield. A New School of Gregorian Chant. Fr. Pustet, 1906.