Abel, G. P. (2021). What, if anything, is out there (First edition.). Indigo River Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAbel, Gene P. What, If Anything, Is Out There. First edition. Pensacola, FL: Indigo River Publishing, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAbel, Gene P. What, If Anything, Is Out There. First edition. Indigo River Publishing, 2021.
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