Franklin

MLA

Lehmann, Lilli, Richard Aldrich, and Clara Willenbücher. How to Sing (meine Gesangkunst). New rev. and supplemented ed., New York: Macmillan, 1944.

APA

Lehmann, L., Aldrich, R., & Willenbücher, C. (1944). How to sing (Meine Gesangkunst). New rev. and supplemented ed., New York: Macmillan.

Chicago

Lehmann, Lilli, Richard Aldrich, and Clara Willenbücher. How to Sing (meine Gesangkunst). New rev. and supplemented ed., New York: Macmillan, 1944.