A geological classification of rocks, with descriptive synopses of the species and varieties, comprising the elements of practical geology

Chicago citation style
Macculloch, John, 1773-1835. A geological classification of rocks, with descriptive synopses of the species and varieties, comprising the elements of practical geology. 1821. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/006223449. (Accessed November 15, 2018.)
APA citation style
Macculloch, John, 1773-1835, (1821) A geological classification of rocks, with descriptive synopses of the species and varieties, comprising the elements of practical geology. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/006223449
MLA citation style
Macculloch, John, 1773-1835. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/006223449>.
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