Euclase in the Handbook of Mineralogy, Mineral Data Publishers PDF http://rruff.geo.arizona.edu/doclib/hom/euclase.pdf
Chisholm, Hugh, ed. (1911). "Euclase" . Encyclopædia Britannica (11th ed.). Cambridge University Press. /wiki/Hugh_Chisholm
Euclase on Mindat.org with location data http://www.mindat.org/min-1418.html