Simeons, C. (1978). Coal, its role in tomorrow's technology: A sourcebook on global coal resources (First edition.). Pergamon Press. https://doi.org/10.1016/C2013-0-03018-6
Citace podle Chicago (17th ed.)Simeons, Charles. Coal, Its Role in Tomorrow's Technology: A Sourcebook on Global Coal Resources. First edition. Oxford: Pergamon Press, 1978. https://doi.org/10.1016/C2013-0-03018-6.
Citace podle MLA (9th ed.)Simeons, Charles. Coal, Its Role in Tomorrow's Technology: A Sourcebook on Global Coal Resources. First edition. Pergamon Press, 1978. https://doi.org/10.1016/C2013-0-03018-6.
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