Congdon, R. J. (1977). Introduction to appropriate technology: Toward a simpler life-style. Rodale Press.
Lua i Stíl Chicago (17ú heag.)Congdon, R. J. Introduction to Appropriate Technology: Toward a Simpler Life-style. Emmaus, Pa.: Rodale Press, 1977.
Lua MLA (8ú heag.)Congdon, R. J. Introduction to Appropriate Technology: Toward a Simpler Life-style. Rodale Press, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.