BRIDWELL, N. (1985). CLIFFORD'S FAMILY. SCHOLASTIC INS.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBRIDWELL, NORMAN. CLIFFORD'S FAMILY. SCHOLASTIC INS, 1985.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBRIDWELL, NORMAN. CLIFFORD'S FAMILY. SCHOLASTIC INS, 1985.
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