Lyell, C. (1837). Principles of geology: Being an inquiry how far the former changes of the earth's surface are referable to causes now in operation (1st American from the 5th and last London ed.). J. Kay, jun. & brother; J.I. Kay & Co..
Παραπομπή σε μορφή Chicago (17η εκδ.)Lyell, Charles. Principles of Geology: Being an Inquiry How Far the Former Changes of the Earth's Surface Are Referable to Causes Now in Operation. 1st American from the 5th and last London ed. Philadelphia, Pittsburg: J. Kay, jun. & brother; J.I. Kay & Co., 1837.
Παραπομπή σε μορφή MLA (8th εκδ.)Lyell, Charles. Principles of Geology: Being an Inquiry How Far the Former Changes of the Earth's Surface Are Referable to Causes Now in Operation. 1st American from the 5th and last London ed. J. Kay, jun. & brother; J.I. Kay & Co., 1837.