एपीए उद्धरण

Covey, S. R. (2002). Principle centered leadership. Pocket books.

शिकागो स्टाइल उद्धरण

Covey, Stephen R. Principle Centered Leadership. London.: Pocket books, 2002.

एमएलए उद्धरण

Covey, Stephen R. Principle Centered Leadership. Pocket books, 2002.