Downer, A. (2016). Smart and spineless: Exploring invertebrate intelligence. Twenty-First Century Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDowner, Ann. Smart and Spineless: Exploring Invertebrate Intelligence. Minneapolis: Twenty-First Century Books, 2016.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDowner, Ann. Smart and Spineless: Exploring Invertebrate Intelligence. Twenty-First Century Books, 2016.
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