APA-referens (7:e uppl.)

Durrell, M., & Hammer, A. E. (2017). Hammer's German grammar and usage (Sixth edition.). Routledge.

Chicago-referens (17:e uppl.)

Durrell, Martin, och A. E. Hammer. Hammer's German Grammar and Usage. Sixth edition. Milton Park, Abingdon, Oxon: Routledge, 2017.

MLA-referens (9:e uppl.)

Durrell, Martin, och A. E. Hammer. Hammer's German Grammar and Usage. Sixth edition. Routledge, 2017.