Institute for the Future. (1968). Futures. Butterworth Scientific.
Lua i Stíl Chicago (17ú heag.)Institute for the Future. Futures. Guildford, Inglaterra: Butterworth Scientific, 1968.
Lua MLA (8ú heag.)Institute for the Future. Futures. Butterworth Scientific, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.