Gaya APA

Goetbals, G, R. et al (2004). Encyclopedia of leadership (Volume 1 dan 4). London and New York: California.Sage Publications,Inc.

Gaya MLA

Goetbals, George, R.. et al. "Encyclopedia of leadership". Volume 1 dan 4 London and New York: California.Sage Publications,Inc, 2004. Referensi.