Volcanoes. Columbia University. Процитовано 18 червня 2019.
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Cross, Whitman; Iddings, Joseph P.; Pirsson, Louis V.; Washington, Henry S. (September 1902). A Quantitative Chemico-Mineralogical Classification and Nomenclature of Igneous Rocks. The Journal of Geology. 10 (6): 555—690. Bibcode:1902JG.....10..555C. doi:10.1086/621030.
Cross, Whitman; Iddings, J. P.; Pirsson, L. V.; Washington, H. S. (September 1912). Modifications of the "Quantitative System of Classification of Igneous Rocks". The Journal of Geology. 20 (6): 550—561. Bibcode:1912JG.....20..550C. doi:10.1086/621996.
Cross, Whitman; Iddings, Joseph P.; Pirsson, Louis V.; Washington, Henry S. (September 1902). A Quantitative Chemico-Mineralogical Classification and Nomenclature of Igneous Rocks. The Journal of Geology. 10 (6): 555—690. Bibcode:1902JG.....10..555C. doi:10.1086/621030.
Cross, Whitman; Iddings, J. P.; Pirsson, L. V.; Washington, H. S. (September 1912). Modifications of the "Quantitative System of Classification of Igneous Rocks". The Journal of Geology. 20 (6): 550—561. Bibcode:1912JG.....20..550C. doi:10.1086/621996.