Waitley, D. (1995). Empires of the Mind. Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Waitley, Denis. Empires of the Mind. Delhi: Cengage Learning, 1995.
Lua MLA (9ú heag.)Waitley, Denis. Empires of the Mind. Cengage Learning, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.