APA (7th ed.) Citation

Hügle, G. (1928). Catechism of Gregorian chant. Fischer.

Chicago Style (17th ed.) Citation

Hügle, Gregory. Catechism of Gregorian Chant. New York: Fischer, 1928.

MLA (9th ed.) Citation

Hügle, Gregory. Catechism of Gregorian Chant. Fischer, 1928.

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