Sewell, W. R. D., & Foster, H. D. (1976). Images of Canadian futures: The role of conservation and renewable energy. Environment Canada.
Lua i Stíl Chicago (17ú heag.)Sewell, W. R. Derrick, agus Harold D. Foster. Images of Canadian Futures: The Role of Conservation and Renewable Energy. Ottawa: Environment Canada, 1976.
Lua MLA (8ú heag.)Sewell, W. R. Derrick, agus Harold D. Foster. Images of Canadian Futures: The Role of Conservation and Renewable Energy. Environment Canada, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.