Lua APA (7ú heag.)

Gangel, K. O. (1974). Competent to lead. Moody Press.

Lua i Stíl Chicago (17ú heag.)

Gangel, Kenneth O. Competent to Lead. Moody Press, 1974.

Lua MLA (9ú heag.)

Gangel, Kenneth O. Competent to Lead. Moody Press, 1974.

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