Flynn, I. (2020). Sonic the hedgehog (2018), volume 5: Crisis city (Collected.). IDW Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFlynn, Ian. Sonic the Hedgehog (2018), Volume 5: Crisis City. Collected. San Diego: IDW Publishing, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFlynn, Ian. Sonic the Hedgehog (2018), Volume 5: Crisis City. Collected. IDW Publishing, 2020.
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