Harley, B., & Gustavson, A. (2014). Charlie Bumpers vs. The Squeaking Skull (First edition.). Peachtree Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHarley, Bill, और Adam Gustavson. Charlie Bumpers Vs. The Squeaking Skull. First edition. Atlanta, Georgia: Peachtree Publishers, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHarley, Bill, और Adam Gustavson. Charlie Bumpers Vs. The Squeaking Skull. First edition. Peachtree Publishers, 2014.
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