APA (7th ed.) Citation

(2021). Happy birthday (1. Auflage.). Groh.

Chicago Style (17th ed.) Citation

Happy Birthday. 1. Auflage. Germering: Groh, 2021.

MLA (9th ed.) Citation

Happy Birthday. 1. Auflage. Groh, 2021.

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