Gaya APA

Covey, S, R. (1990). The Seven Habits of Highly Effective People : Restoring The Character ethic . New York: Rumah Sakit Immanuel.

Gaya MLA

Covey, Stephen, R.. "The Seven Habits of Highly Effective People : Restoring The Character ethic". New York: Rumah Sakit Immanuel, 1990. Text.