APA-ийн эшлэл(7 дахь хэвлэлт)

Gostick, A. R., & Christopher, S. (2008). The levity effect: Why it pays to lighten up. John Wiley & Sons.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Gostick, Adrian Robert, ба Scott Christopher. The Levity Effect: Why It Pays to Lighten Up. Hoboken, N.J.: John Wiley & Sons, 2008.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Gostick, Adrian Robert, ба Scott Christopher. The Levity Effect: Why It Pays to Lighten Up. John Wiley & Sons, 2008.