Tohutoro APA (7th ed.)
Covey, S. R. (1991). Principle-centered leadership. Pocket books.
Tohutoru Kātū Chicago (17th ed.)
Covey, Stephen R. Principle-centered Leadership. London: Pocket books, 1991.
Tohutoro MLA (9th ed.)
Covey, Stephen R. Principle-centered Leadership. Pocket books, 1991.
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