Tohutoro APA (7th ed.)
Covey, S. R. (1990). Principle centered leadership. Simon & Schuster.
Tohutoru Kātū Chicago (17th ed.)
Covey, Stephen R. Principle Centered Leadership. London: Simon & Schuster, 1990.
Tohutoro MLA (9th ed.)
Covey, Stephen R. Principle Centered Leadership. Simon & Schuster, 1990.
Kia tūpato: Kāore pea ēnei kupu hautoa i te ōrite pū 100%.