Ion, D. C. (1975). Availability of world energy resources. Graham and Trotman Ltd.
Lua i Stíl Chicago (17ú heag.)Ion, D. C. Availability of World Energy Resources. London: Graham and Trotman Ltd, 1975.
Lua MLA (9ú heag.)Ion, D. C. Availability of World Energy Resources. Graham and Trotman Ltd, 1975.
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