BIBLIOGRAPHY
1. Gubelin E. J 1974 "The Emerald Deposit at Lake Maniara, Tanzania" Lapidary Journal, May 1974, p. 338-344, 346-347, 359-360
2. Sinkankas J. 1981 "Emeralds and Other Beryls" Pensylvania, Chilton Book Co. p. 542-548