EHLERS, E. G. (1982). Petrology: Igneous, sedimentary, and metamorphic. W.H. Freeman and Company.
Chicago-viite (17. p.)EHLERS, Ernest G. Petrology: Igneous, Sedimentary, and Metamorphic. W.H. Freeman and Company, 1982.
MLA-viite (8. p.)EHLERS, Ernest G. Petrology: Igneous, Sedimentary, and Metamorphic. W.H. Freeman and Company, 1982.
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