Gaya APA

Covey, S, R. et al (1994). First Things First : to live, to love, to learn, to leave a legacy (1). New York, USA: Simon & Schuster.

Gaya MLA

Covey, Stephen, R.. et al. "First Things First : to live, to love, to learn, to leave a legacy". 1 New York, USA: Simon & Schuster, 1994. Non Fiction.