APA

Covey S., .The 7 Habits of Highly Effective Teens. New York: Fireside book.

Chicago

Covey S, .The 7 Habits of Highly Effective Teens. New York: Fireside book.

Harvard

Covey S., .The 7 Habits of Highly Effective Teens. New York: Fireside book.

MLA

Covey S, .New York: Fireside book. .