Gaya APA

Covey, S, R. et al (1994). First Things First: to live, to learn, to leave legacy (Cet. 10). New York: Fireside Book.

Gaya MLA

Covey, Stephen, R.. et al. "First Things First: to live, to learn, to leave legacy". Cet. 10 New York: Fireside Book, 1994. Text.