Lua APA (7ú heag.)

Covey, S. R. (1992). Principle-centered leadership. Simon & Schuster.

Lua i Stíl Chicago (17ú heag.)

Covey, Stephen R. Principle-centered Leadership. New York, N.Y.: Simon & Schuster, 1992.

Lua MLA (8ú heag.)

Covey, Stephen R. Principle-centered Leadership. Simon & Schuster, 1992.

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