APA

Dekkers W. M., Shell, World Petroleum Congress (15th. : 1997 : Beijing) & Shell.Siting of new refineries and barriers to development of refineries, terminals and marketing sites. : .

Chicago

Dekkers Walter M.M, Shell, World Petroleum Congress (15th. : 1997 : Beijing) and Shell.Siting of new refineries and barriers to development of refineries, terminals and marketing sites. : .

Harvard

Dekkers W. M., Shell, World Petroleum Congress (15th. : 1997 : Beijing) and Shell.Siting of new refineries and barriers to development of refineries, terminals and marketing sites. : .

MLA

Dekkers Walter M.M, Shell, World Petroleum Congress (15th. : 1997 : Beijing) and Shell.: . .