↑ Godfrey, S. M.; McAuliffe, C. A.; Mackie, A. G.; Pritchard, R. G. (1998). Nicholas C. Norman, biên tập. Chemistry of arsenic, antimony, and bismuth. Springer. tr. 90. ISBN0-7514-0389-X.
↑ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN0-07-049439-8