Cita APA (7th ed.)

Freeman, D. You Can Be Happy: The Scientifically Proven Way to Change How You Feel (1.). Pearson Education UK.

Cita Chicago (17th ed.)

Freeman, Daniel;Freeman. You Can Be Happy: The Scientifically Proven Way to Change How You Feel. 1. Pearson Education UK.

Cita MLA (8th ed.)

Freeman, Daniel;Freeman. You Can Be Happy: The Scientifically Proven Way to Change How You Feel. 1. Pearson Education UK.