Power, J. E. (1972). Travel markets of the future.
Lua i Stíl Chicago (17ú heag.)Power, James E. Travel Markets of the Future. New York, Hotel Sales Management Association, 1972.
Lua MLA (9ú heag.)Power, James E. Travel Markets of the Future. 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.