(1987). Forward Thinking: The Pragmatists Guide To Todays Business Trends / Robert D. Gilbreath. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Forward Thinking: The Pragmatists Guide To Todays Business Trends / Robert D. Gilbreath. McGraw-Hill, 1987.
Lua MLA (8ú heag.)Forward Thinking: The Pragmatists Guide To Todays Business Trends / Robert D. Gilbreath. McGraw-Hill, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.