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.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रContent Television, Public Broadcasting Service (U.S.), Anna Maxwell Martin, Rachael Stirling, Sophie Rundle, और Julie Graham. The Bletchley Circle: Cracking a Killer's Code. [United States]: PBS Distribution, 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रContent Television, et al. The Bletchley Circle: Cracking a Killer's Code. PBS Distribution, 2013.
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