Style de citation APA

Covey,Stephen R. (1991). Principle centred leadership. Pocket Books.

Style de citation Chicago

Covey,Stephen R. Principle Centred Leadership. London: Pocket Books, 1991.

Style de citation MLA

Covey,Stephen R. Principle Centred Leadership. Pocket Books, 1991.

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