Kirpal Singh. (2004). Thinking hats and coloured turbans. Pearson/Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Kirpal Singh. Thinking Hats and Coloured Turbans. Singapore: Pearson/Prentice Hall, 2004.
Lua MLA (8ú heag.)Kirpal Singh. Thinking Hats and Coloured Turbans. Pearson/Prentice Hall, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.