Gutman, D. (2009). Officer spence makes no sense: Officer spence makes no sense!
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGutman, Dan. Officer Spence Makes No Sense: Officer Spence Makes No Sense! 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGutman, Dan. Officer Spence Makes No Sense: Officer Spence Makes No Sense! 2009.
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