Cita APA (7a ed.)

Durrell, M., & Hammer, A. E. (1997). Hammer's German grammar and usage (3rd ed.). NTC Pub. Group.

Cita Chicago Style (17a ed.)

Durrell, Martin, y A. E. Hammer. Hammer's German Grammar and Usage. 3rd ed. Lincolnwood, Ill: NTC Pub. Group, 1997.

Cita MLA (9a ed.)

Durrell, Martin, y A. E. Hammer. Hammer's German Grammar and Usage. 3rd ed. NTC Pub. Group, 1997.