Gaya APA

Covey, S, R. (1994). The Seven Habits of Highly Effective People: Powerful Lessons in Porsonal Change (Cet. 1.--). New York: Franklin Covey.

Gaya MLA

Covey, Stephen, R.. "The Seven Habits of Highly Effective People: Powerful Lessons in Porsonal Change". Cet. 1.-- New York: Franklin Covey, 1994. Text.