APA (7th ed.) Citation

(1992). Gregorian chant: Christmas = Gregorianischer Choral = Chant grégorien. Polydor Internat.

Chicago Style (17th ed.) Citation

Gregorian Chant: Christmas = Gregorianischer Choral = Chant Grégorien. Hamburg: Polydor Internat, 1992.

MLA (9th ed.) Citation

Gregorian Chant: Christmas = Gregorianischer Choral = Chant Grégorien. Polydor Internat, 1992.

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