APA (7th ed.) Citation

Jones, D. W. (1991). Castle in the air. Greenwillow Books.

Chicago Style (17th ed.) Citation

Jones, Diana Wynne. Castle in the Air. New York: Greenwillow Books, 1991.

MLA (8th ed.) Citation

Jones, Diana Wynne. Castle in the Air. Greenwillow Books, 1991.

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