Webb, W. F. (1948). Foreign land and freshwater shells: From all parts of the world except the United states and Canada. St. Petersburg Printing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWebb, Walter Freeman. Foreign Land and Freshwater Shells: From All Parts of the World Except the United States and Canada. Florida: St. Petersburg Printing, 1948.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWebb, Walter Freeman. Foreign Land and Freshwater Shells: From All Parts of the World Except the United States and Canada. St. Petersburg Printing, 1948.
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