Goethals, G. R., Sorensen, G., & Burns, J. M. (2004). Encyclopedia of leadership. Sage Publications.
Lua i Stíl Chicago (17ú heag.)Goethals, George R., Georgia Sorensen, agus James MacGregor Burns. Encyclopedia of Leadership. Thousand Oaks, Calif: Sage Publications, 2004.
Lua MLA (9ú heag.)Goethals, George R., et al. Encyclopedia of Leadership. Sage Publications, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.