APA (7th ed.) Citation

Goscinny & Uderzo. (2009). Asterix and Obelix's birthday: The golden book. Orion Children's.

Chicago Style (17th ed.) Citation

Goscinny and Uderzo. Asterix and Obelix's Birthday: The Golden Book. London: Orion Children's, 2009.

MLA (9th ed.) Citation

Goscinny and Uderzo. Asterix and Obelix's Birthday: The Golden Book. Orion Children's, 2009.