Warren, e. (1977). Long- range planning: The executive view point. Taraporewala.
Lua i Stíl Chicago (17ú heag.)Warren, e. Long- Range Planning: The Executive View Point. Mumbai: Taraporewala, 1977.
Lua MLA (9ú heag.)Warren, e. Long- Range Planning: The Executive View Point. Taraporewala, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.