APA (7th ed.) Citation

Northup, S. (2014). 12 years a slave: A true story. William Collins.

Chicago Style (17th ed.) Citation

Northup, Solomon. 12 Years a Slave: A True Story. London: William Collins, 2014.

MLA (9th ed.) Citation

Northup, Solomon. 12 Years a Slave: A True Story. William Collins, 2014.

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