International Energy Agency (IEA) & Organisation for Economic Co-operation and Development (OECD). (1992). Energy policies. Czech and Slovak Federal Republic. OECD/IEA.
Dyfyniad Arddull ChicagoInternational Energy Agency (IEA) and Organisation for Economic Co-operation and Development (OECD). Energy Policies. Czech and Slovak Federal Republic. Paris: OECD/IEA, 1992.
Dyfyniad MLAInternational Energy Agency (IEA) and Organisation for Economic Co-operation and Development (OECD). Energy Policies. Czech and Slovak Federal Republic. OECD/IEA, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.