Helcke, G. (1981). The energy saving guide: Tables for assessing the profitability of energy saving measures with explanatory notes and worked examples (First edition.). Pergamon Press. https://doi.org/10.1016/C2013-0-03476-7
Citace podle Chicago (17th ed.)Helcke, George. The Energy Saving Guide: Tables for Assessing the Profitability of Energy Saving Measures with Explanatory Notes and Worked Examples. First edition. Oxford: Pergamon Press, 1981. https://doi.org/10.1016/C2013-0-03476-7.
Citace podle MLA (9th ed.)Helcke, George. The Energy Saving Guide: Tables for Assessing the Profitability of Energy Saving Measures with Explanatory Notes and Worked Examples. First edition. Pergamon Press, 1981. https://doi.org/10.1016/C2013-0-03476-7.
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