David Joseph Schwartz. (2006). The magic of thinking big. Pocket.
Lua i Stíl Chicago (17ú heag.)David Joseph Schwartz. The Magic of Thinking Big. London: Pocket, 2006.
Lua MLA (8ú heag.)David Joseph Schwartz. The Magic of Thinking Big. Pocket, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.