Cottrell Boyce, F. (2019). Sputnik's guide to life on Earth (First U.S. paperback edition.). Walden Pond Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCottrell Boyce, Frank. Sputnik's Guide to Life on Earth. First U.S. paperback edition. New York, NY: Walden Pond Press, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCottrell Boyce, Frank. Sputnik's Guide to Life on Earth. First U.S. paperback edition. Walden Pond Press, 2019.
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