APA

Lev-On M., Gaasbeek A., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B. & Gaasbeek A.The oil & gas industry environmental, social and economic responsibilities. : .

Chicago

Lev-On Miriam, Gaasbeek Aart, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil) and Gaasbeek Aart.The oil & gas industry environmental, social and economic responsibilities. : .

Harvard

Lev-On M., Gaasbeek A., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B. and Gaasbeek A.The oil & gas industry environmental, social and economic responsibilities. : .

MLA

Lev-On Miriam, Gaasbeek Aart, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil) and Gaasbeek Aart.: . .