Gelder, C. (2022). Bonnie the Cow & friends: 20 loveable animals & birds to crochet using chunky yarn. Search Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGelder, Claire. Bonnie the Cow & Friends: 20 Loveable Animals & Birds to Crochet Using Chunky Yarn. Tunbridge Wells: Search Press, 2022.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGelder, Claire. Bonnie the Cow & Friends: 20 Loveable Animals & Birds to Crochet Using Chunky Yarn. Search Press, 2022.
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