Hall, M. (1987). Mo'-ti-va-tion: How to be a positive force in a negative world. Good-News encounters, inc.
Cita Chicago (17th ed.)Hall, Michael. Mo'-ti-va-tion: How to Be a Positive Force in a Negative World. Missouri: Good-News encounters, inc, 1987.
Cita MLA (9th ed.)Hall, Michael. Mo'-ti-va-tion: How to Be a Positive Force in a Negative World. Good-News encounters, inc, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.