Citace podle APA

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

Styl Chicago

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

Citace podle MLA

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

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