Zickefoose, J. (2012). The bluebird effect: Uncommon bonds with common birds. Houghton Mifflin Harcourt.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रZickefoose, Julie. The Bluebird Effect: Uncommon Bonds with Common Birds. Boston: Houghton Mifflin Harcourt, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रZickefoose, Julie. The Bluebird Effect: Uncommon Bonds with Common Birds. Houghton Mifflin Harcourt, 2012.
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