APA (7th ed.) Citation

Frey, C., & Haupt, G. (1961). Grammatik 12. Volk und Wissen.

Chicago Style (17th ed.) Citation

Frey, Christa, and Gertrud Haupt. Grammatik 12. Berlin: Volk und Wissen, 1961.

MLA (8th ed.) Citation

Frey, Christa, and Gertrud Haupt. Grammatik 12. Volk und Wissen, 1961.

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