Cita APA (7th ed.)
Powell, J. (1989). Happiness is an inside job. Tabor.
Cita Chicago (17th ed.)
Powell, John. Happiness Is an Inside Job. Valencia: Tabor, 1989.
Cita MLA (9th ed.)
Powell, John. Happiness Is an Inside Job. Tabor, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.