Pyenson, N. (2018). Spying on whales: The past, present, and future of earth's most awesome creatures. Viking.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPyenson, Nick. Spying on Whales: The Past, Present, and Future of Earth's Most Awesome Creatures. New York, New York: Viking, 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPyenson, Nick. Spying on Whales: The Past, Present, and Future of Earth's Most Awesome Creatures. Viking, 2018.
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