Linstone, H. A., Simmonds, W. H. C., & Bäckstrand, G. (1977). Futures research: New directions. Addison-Wesley Pub. Co., Advanced Book Program.
Lua i Stíl Chicago (17ú heag.)Linstone, Harold A., Walter Henry Clive Simmonds, agus Göran Bäckstrand. Futures Research: New Directions. Reading, Mass.: Addison-Wesley Pub. Co., Advanced Book Program, 1977.
Lua MLA (9ú heag.)Linstone, Harold A., et al. Futures Research: New Directions. Addison-Wesley Pub. Co., Advanced Book Program, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.