Smalley, G., & Trent, J. (1990). The two sides of love: Using personality strengths to greatly improve your relationships. Tyndale.
Chicago-referens (17:e uppl.)Smalley, Gary, och John Trent. The Two Sides of Love: Using Personality Strengths to Greatly Improve Your Relationships. Wheaton: Tyndale, 1990.
MLA-referens (9:e uppl.)Smalley, Gary, och John Trent. The Two Sides of Love: Using Personality Strengths to Greatly Improve Your Relationships. Tyndale, 1990.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.