APA (7th ed.) Citation

Gratzki, B. (2007). Happy birthday! Pattloch.

Chicago Style (17th ed.) Citation

Gratzki, Bettina. Happy Birthday! München: Pattloch, 2007.

MLA (9th ed.) Citation

Gratzki, Bettina. Happy Birthday! Pattloch, 2007.

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