APA

Prévot C., Valais M., World Petroleum Congress (16th. : 2000 jun. 11-15 : Calgary A. C. & Valais M.World petroleum market trends. : .

Chicago

Prévot Charles, Valais Michel, World Petroleum Congress (16th. : 2000 jun. 11-15 : Calgary Alberta Canada) and Valais Michel.World petroleum market trends. : .

Harvard

Prévot C., Valais M., World Petroleum Congress (16th. : 2000 jun. 11-15 : Calgary A. C. and Valais M.World petroleum market trends. : .

MLA

Prévot Charles, Valais Michel, World Petroleum Congress (16th. : 2000 jun. 11-15 : Calgary Alberta Canada) and Valais Michel.: . .