APA
Ungar P., Virágh A., World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) & Virágh A.Central control of crude oil and natural gas pipelines in Hungary. : .
Chicago
Ungar Peter, Virágh Andras, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) and Virágh Andras.Central control of crude oil and natural gas pipelines in Hungary. : .
Harvard
Ungar P., Virágh A., World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) and Virágh A.Central control of crude oil and natural gas pipelines in Hungary. : .
MLA
Ungar Peter, Virágh Andras, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) and Virágh Andras.: . .