APA (7th ed.) Citation

Barton, L. (2010). Twenty-one locks. Quercus.

Chicago Style (17th ed.) Citation

Barton, Laura. Twenty-one Locks. London: Quercus, 2010.

MLA (9th ed.) Citation

Barton, Laura. Twenty-one Locks. Quercus, 2010.

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