^ Magill, Frank N. et al. (1998), The Ancient World: Dictionary of World Biography, Volume 1, Pasadena, Chicago, London,: Fitzroy Dearborn Publishers, Salem Press, p. 1010, 0-89356-313-7.
^ Holt, Frank L. (1989), Alexander the Great and Bactria: the Formation of a Greek Frontier in Central Asia, Leiden, New York, Copenhagen, Cologne: E. J. Brill, pp 64–65 (see footnote #63 for a discussion on Spitamenes and Apama), 90-04-08612-9.