Gangel, K. O. (1974). Competent to lead. Moody Press.
Cita Chicago (17th ed.)Gangel, Kenneth O. Competent to Lead. Moody Press, 1974.
Cita MLA (9th ed.)Gangel, Kenneth O. Competent to Lead. Moody Press, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.