1. Amstutz, G.C., and Bank, H., 1977, Geologic, petrographic and mineralogic observations in some mines of emerald, tanzanite, tsavorite and ruby in Tanzania and Kenya: Deutschen Gemmologischen Gesellschaft, Zeitschrift, v. 26, p. 118–127.
2. Anderson, B.W., 1950, The absorption spectra of emerald and alexandrite: Gems and Gemology, v. 6, p. 263–266, 291.
3. Anderson, B.W., 1966, Chromium as a criterion for emerald: Journal of Gemmology, v. 10, p. 41–45.
4. Anderson, S.M., 1975, A note on the occurrence of emerald at Mayfield Farm, Fort Victoria: Rhodesia, Southern, Geological Survey, Annals 1, p. 60-61, Journal of Gemmology, v. 15, p. 80–82.
5. Anderson, S.M., 1976, Notes on the occurrence and mineralogy of emeralds in Rhodesia: Rhodesia, Southern, Geological Survey, Annals, v. 2, p. 50–55.