APA (7th ed.) Citation

Keene, C. (1997). The clue of the velvet mask (30). Grosset & Dunlap.

Chicago Style (17th ed.) Citation

Keene, Carolyn. The Clue of the Velvet Mask (30). New York: Grosset & Dunlap, 1997.

MLA (9th ed.) Citation

Keene, Carolyn. The Clue of the Velvet Mask (30). Grosset & Dunlap, 1997.