APA (7th ed.) Citation

Keene,Carolyn. The Secret in the Old Attic. William Collin.

Chicago Style (17th ed.) Citation

Keene,Carolyn. The Secret in the Old Attic. London: William Collin.

MLA (9th ed.) Citation

Keene,Carolyn. The Secret in the Old Attic. William Collin.

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