Koenig, L. W. (1975). The Chief Executive (3rd ed.). Harcourt,Brace,and World.
Lua i Stíl Chicago (17ú heag.)Koenig, Louis William. The Chief Executive. 3rd ed. New York: Harcourt,Brace,and World, 1975.
Lua MLA (9ú heag.)Koenig, Louis William. The Chief Executive. 3rd ed. Harcourt,Brace,and World, 1975.
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