Gaya APA

Covey, S, R. et al (1994). The First Things First: To Live, to Love, to Learn, to Leave a Legacy . New York: A Fireside Book.

Gaya MLA

Covey, Stephen, R.. et al. "The First Things First: To Live, to Love, to Learn, to Leave a Legacy". New York: A Fireside Book, 1994. Text.