International Energy Agency & IEA International Conference on Clean and Efficient Use of Coal. (1993). Clean and efficient use of coal: The new era for low-rank coal : Budapest, Hungary, February 1992 : conference proceedings. International Energy Agency.
Citação norma ChicagoInternational Energy Agency and IEA International Conference on Clean and Efficient Use of Coal. Clean and Efficient Use of Coal: The New Era for Low-rank Coal : Budapest, Hungary, February 1992 : Conference Proceedings. Paris, France: International Energy Agency, 1993.
Citação norma MLAInternational Energy Agency and IEA International Conference on Clean and Efficient Use of Coal. Clean and Efficient Use of Coal: The New Era for Low-rank Coal : Budapest, Hungary, February 1992 : Conference Proceedings. International Energy Agency, 1993.