Catholic Church, Ruhland, K., & Niederaltaicher Scholaren. Choralschola. (1994). Gregorian chant. Sony Classical.
Chicago Style (17th ed.) CitationCatholic Church, Konrad Ruhland, and Niederaltaicher Scholaren. Choralschola. Gregorian Chant. [S.l.]: Sony Classical, 1994.
MLA (8th ed.) CitationCatholic Church, et al. Gregorian Chant. Sony Classical, 1994.
Warning: These citations may not always be 100% accurate.