Berenstain, J., & Berenstain, M. (2009). The Berenstain Bears' class trip. HarperCollins Children's Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBerenstain, Jan, और Mike Berenstain. The Berenstain Bears' Class Trip. New York, NY: HarperCollins Children's Books, 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBerenstain, Jan, और Mike Berenstain. The Berenstain Bears' Class Trip. HarperCollins Children's Books, 2009.
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