APA (7th ed.) Citation

Catholic Church, Ruhland, K., & Niederaltaicher Scholaren. Choralschola. (1994). Gregorian chant. Sony Classical.

Chicago Style (17th ed.) Citation

Catholic Church, Konrad Ruhland, and Niederaltaicher Scholaren. Choralschola. Gregorian Chant. [S.l.]: Sony Classical, 1994.

MLA (8th ed.) Citation

Catholic Church, et al. Gregorian Chant. Sony Classical, 1994.

Warning: These citations may not always be 100% accurate.