APA-viite

Covey, S. R. (1990). Seven Habits of Highly Offective People: Restoring the Charactor Ethic. Fireside.

Chicago-tyylinen lähdeviittaus

Covey, Stephen R. Seven Habits of Highly Offective People: Restoring the Charactor Ethic. New York: Fireside, 1990.

MLA-viite

Covey, Stephen R. Seven Habits of Highly Offective People: Restoring the Charactor Ethic. Fireside, 1990.