APA (7th ed.) Citation

Content Television, Public Broadcasting Service (U.S.), Maxwell Martin, A., Stirling, R., Rundle, S., & Graham, J. (2013). The Bletchley circle: Cracking a killer's code. PBS Distribution.

Chicago Style (17th ed.) Citation

Content Television, Public Broadcasting Service (U.S.), Anna Maxwell Martin, Rachael Stirling, Sophie Rundle, and Julie Graham. The Bletchley Circle: Cracking a Killer's Code. [United States]: PBS Distribution, 2013.

MLA (8th ed.) Citation

Content Television, et al. The Bletchley Circle: Cracking a Killer's Code. PBS Distribution, 2013.

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