Zeitz, P. (2007). The art and craft of problem solving (2nd ed.). John Wiley.
Chicago-referens (17:e uppl.)Zeitz, Paul. The Art and Craft of Problem Solving. 2nd ed. Hoboken, NJ: John Wiley, 2007.
MLA-referens (8:e uppl.)Zeitz, Paul. The Art and Craft of Problem Solving. 2nd ed. John Wiley, 2007.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.