Attenborough, D. (1990). The trials of life: A natural history of animal behavior. Little, Brown.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAttenborough, David. The Trials of Life: A Natural History of Animal Behavior. Boston: Little, Brown, 1990.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAttenborough, David. The Trials of Life: A Natural History of Animal Behavior. Little, Brown, 1990.
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