Cole, V., Gaskin, R. F., & Sim, R. J. (1993). Perspectives: On leadership training. NEGST.
Lua i Stíl Chicago (17ú heag.)Cole, V.B, R. F. Gaskin, agus R. J. Sim. Perspectives: On Leadership Training. Nairobi: NEGST, 1993.
Lua MLA (9ú heag.)Cole, V.B, et al. Perspectives: On Leadership Training. NEGST, 1993.
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