Polk, P. (2016). Collecting rocks, gems and minerals: Identification, values, lapidary uses (3rd edition.). Krause Publications, a division of F+W Media, Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPolk, Patti. Collecting Rocks, Gems and Minerals: Identification, Values, Lapidary Uses. 3rd edition. Iola, WI: Krause Publications, a division of F+W Media, Inc., 2016.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPolk, Patti. Collecting Rocks, Gems and Minerals: Identification, Values, Lapidary Uses. 3rd edition. Krause Publications, a division of F+W Media, Inc., 2016.
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