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3. H.W. Fairbairn and J.F. Schairer, “A Test of the Accuracy of Chemical Analysis of Silicate Rocks,” Am. Mineralogist, Vol. 37, 1952, p. 744.
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5. A.A. Chodos and C.G. Engel, “Fluorescent X-ray Spectrographic Analyses of Amphibolite Rocks and Constituent Hornblendes,” Advances in X-Ray Analysis, Vol. 4, University of Denver, Plenum Press, New York, 1961, pp. 401–413.