APA (7th ed.) Citation

Gregory, P. (2005). The constant princess. Touchstone book.

Chicago Style (17th ed.) Citation

Gregory, Philippa. The Constant Princess. New York [etc.]: Touchstone book, 2005.

MLA (9th ed.) Citation

Gregory, Philippa. The Constant Princess. Touchstone book, 2005.

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