Cita APA (7th ed.)
Gostick, A. R., & Christopher, S. (2008). The levity effect: Why it pays to lighten up. John Wiley & Sons.
Cita Chicago (17th ed.)
Gostick, Adrian Robert, i Scott Christopher. The Levity Effect: Why It Pays to Lighten Up. Hoboken, N.J.: John Wiley & Sons, 2008.
Cita MLA (9th ed.)
Gostick, Adrian Robert, i Scott Christopher. The Levity Effect: Why It Pays to Lighten Up. John Wiley & Sons, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.