Starr, M. (2015). Ringo: With a little help. Backbeat Books, an imprint of Hal Leonard Corporation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रStarr, Michael. Ringo: With a Little Help. Milwaukee, WI: Backbeat Books, an imprint of Hal Leonard Corporation, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रStarr, Michael. Ringo: With a Little Help. Backbeat Books, an imprint of Hal Leonard Corporation, 2015.
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