APA

Frey R. K., World Petroleum Congress (13th. : 1991 : Buenos Aires), .Caribbean basin advantages in filling the United States refining capacity shortfall. : .

Chicago

Frey Roger K, World Petroleum Congress (13th. : 1991 : Buenos Aires), .Caribbean basin advantages in filling the United States refining capacity shortfall. : .

Harvard

Frey R. K., World Petroleum Congress (13th. : 1991 : Buenos Aires), .Caribbean basin advantages in filling the United States refining capacity shortfall. : .

MLA

Frey Roger K, World Petroleum Congress (13th. : 1991 : Buenos Aires), .: . .