Yates, D., Hatkoff, C., Hatkoff, J., & Hatkoff, I. (2014). Hope for winter: The true story of a remarkable dolphin friendship. Scholastic Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रYates, David, Craig Hatkoff, Juliana Hatkoff, और Isabella Hatkoff. Hope for Winter: The True Story of a Remarkable Dolphin Friendship. New York, NY: Scholastic Inc., 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रYates, David, et al. Hope for Winter: The True Story of a Remarkable Dolphin Friendship. Scholastic Inc., 2014.
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