APA-viite

Covey, S. R. (1989). The seven habits of highly effective people: Restoring the character ethic. New York: A Fireside Book.

Chicago-tyylinen lähdeviittaus

Covey, Stephen R. The Seven Habits of Highly Effective People: Restoring the Character Ethic. New York: A Fireside Book, 1989.

MLA-viite

Covey, Stephen R. The Seven Habits of Highly Effective People: Restoring the Character Ethic. New York: A Fireside Book, 1989.

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