Chorao, K. (1999). Knock at the door and other baby action rhymes. Dutton Children's Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रChorao, Kay. Knock at the Door and Other Baby Action Rhymes. New York: Dutton Children's Books, 1999.
एमएलए (8वां संस्करण) प्रशस्ति पत्रChorao, Kay. Knock at the Door and Other Baby Action Rhymes. Dutton Children's Books, 1999.
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