APA (7th ed.) Citation

Nebel, U., & Nebel, H. Rechtschreibung. Hueber.

Chicago Style (17th ed.) Citation

Nebel, Ursula, and Heinz Nebel. Rechtschreibung. München: Hueber.

MLA (9th ed.) Citation

Nebel, Ursula, and Heinz Nebel. Rechtschreibung. Hueber.

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