APA
Chandna H., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B., .Import of natural gas & commercial issues. : .
Chicago
Chandna H.P, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil), .Import of natural gas & commercial issues. : .
Harvard
Chandna H., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B., .Import of natural gas & commercial issues. : .
MLA
Chandna H.P, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil), .: . .
