Gaya APA

Covey, S, R. (2004). The 8th Habit from Effectiveness to Greatness (Cet. 1). New York: FranklinCovey Co..

Gaya MLA

Covey, Stephen, R.. "The 8th Habit from Effectiveness to Greatness". Cet. 1 New York: FranklinCovey Co., 2004. Text.