Gaya APA

Covey, S, R. (2001). The Seven Habits Of Highly Effective People : restoring the character ethic (Trawas) . New York: A Firside Book.

Gaya MLA

Covey, Stehen, R.. "The Seven Habits Of Highly Effective People : restoring the character ethic (Trawas)". New York: A Firside Book, 2001. Text.