APA (7th ed.) Citation

Keene. (1953). The clue of the velvet mask. Grosset and Dunlap.

Chicago Style (17th ed.) Citation

Keene. The Clue of the Velvet Mask. New York: Grosset and Dunlap, 1953.

MLA (8th ed.) Citation

Keene. The Clue of the Velvet Mask. Grosset and Dunlap, 1953.

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