APA ציטוט

Keller ,Jeff. (2015). Attitude is everything: Change your attitude change your life. Harper collins publishers.

Chicago Edition Citation

Keller ,Jeff. Attitude Is Everything: Change Your Attitude Change Your Life. Noida: Harper collins publishers, 2015.

ציטוט MLA

Keller ,Jeff. Attitude Is Everything: Change Your Attitude Change Your Life. Harper collins publishers, 2015.