Willrich, M. (1976). Administration of energy shortages: Natural gas and petroleum. Ballinger Publishing Company.
Čikaški stil citiranja (17. izdanje)Willrich, Mason. Administration of Energy Shortages: Natural Gas and Petroleum. Cambridge, Mass: Ballinger Publishing Company, 1976.
MLA način citiranja (9. izdanje)Willrich, Mason. Administration of Energy Shortages: Natural Gas and Petroleum. Ballinger Publishing Company, 1976.
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