Zeitz, P. (2007). The art and craft of problem solving (2nd ed.). John Wiley.
Lua i Stíl Chicago (17ú heag.)Zeitz, Paul. The Art and Craft of Problem Solving. 2nd ed. Hoboken, NJ: John Wiley, 2007.
Lua MLA (8ú heag.)Zeitz, Paul. The Art and Craft of Problem Solving. 2nd ed. John Wiley, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.