Polk, P. (2016). Collecting rocks, gems and minerals: Identification, values, lapidary uses (3rd edition.). Krause Publications, a division of F+W Media, Inc..
Цитирование в стиле Чикаго (17-е изд.)Polk, Patti. Collecting Rocks, Gems and Minerals: Identification, Values, Lapidary Uses. 3rd edition. Iola, WI: Krause Publications, a division of F+W Media, Inc., 2016.
Цитирование MLA (8-е изд.)Polk, Patti. Collecting Rocks, Gems and Minerals: Identification, Values, Lapidary Uses. 3rd edition. Krause Publications, a division of F+W Media, Inc., 2016.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.