APA (7th ed.) Citation
Koch, K., & Haas, E. (1964). Mei Hoamatl: Gemischter Chor. Helbling.
Chicago Style (17th ed.) Citation
Koch, Karl, and Erna Haas. Mei Hoamatl: Gemischter Chor. Innsbruck: Helbling, 1964.
MLA (9th ed.) Citation
Koch, Karl, and Erna Haas. Mei Hoamatl: Gemischter Chor. Helbling, 1964.
Warning: These citations may not always be 100% accurate.