APA (7th ed.) Citation

Asbjørnsen, P. C., & Galdone, P. (1973). The three billy goats Gruff. Clarion Books.

Chicago Style (17th ed.) Citation

Asbjørnsen, Peter Christen, and Paul Galdone. The Three Billy Goats Gruff. New York: Clarion Books, 1973.

MLA (8th ed.) Citation

Asbjørnsen, Peter Christen, and Paul Galdone. The Three Billy Goats Gruff. Clarion Books, 1973.

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