APA (7th ed.) Citation

GRASS, G. (1989). Show your tongue. A Helen and Kurt Wolff Book.

Chicago Style (17th ed.) Citation

GRASS, Gunter. Show Your Tongue. A Helen and Kurt Wolff Book, 1989.

MLA (8th ed.) Citation

GRASS, Gunter. Show Your Tongue. A Helen and Kurt Wolff Book, 1989.

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