Willrich, M. (1976). Administration of energy shortages: Natural gas and petroleum. Ballinger Pub.
Citazione stile Chigago Style (17a edizione)Willrich, Mason. Administration of Energy Shortages: Natural Gas and Petroleum. Cambridge, Mass: Ballinger Pub, 1976.
Citatione MLA (9a ed.)Willrich, Mason. Administration of Energy Shortages: Natural Gas and Petroleum. Ballinger Pub, 1976.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.