Covey, S. R. (1990). Seven Habits of Highly Offective People: Restoring the Charactor Ethic. Fireside.
استشهاد بنمط شيكاغوCovey, Stephen R. Seven Habits of Highly Offective People: Restoring the Charactor Ethic. New York: Fireside, 1990.
MLA استشهادCovey, Stephen R. Seven Habits of Highly Offective People: Restoring the Charactor Ethic. Fireside, 1990.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.