World Gas Conference Nice, France, & International Gas Union. (1973). 12e Congrès mondial du gaz, Nice 73: [rapports] = 12th World Gas Conference, Nice 73 : [reports]. International Gas Union.
Citação do estilo Chicago (17ª ed.)World Gas Conference Nice, France, e International Gas Union. 12e Congrès Mondial Du Gaz, Nice 73: [rapports] = 12th World Gas Conference, Nice 73 : [reports]. London: International Gas Union, 1973.
Citação MLA (8ª ed.)World Gas Conference Nice, France, e International Gas Union. 12e Congrès Mondial Du Gaz, Nice 73: [rapports] = 12th World Gas Conference, Nice 73 : [reports]. International Gas Union, 1973.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.