Style de citation APA

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

Style de citation Chicago

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

Style de citation MLA

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

Attention : ces citations peuvent ne pas être correctes à 100%.