APA

Alley S., McArthur D., Whitehead K., Union Oil Company, World Petroleum Congress (11th. : 1983 : London), McArthur D., Whitehead K. & Union Oil Company.Upgrading of petroleum residues, bitumen, and shale oil. : .

Chicago

Alley S.K, McArthur D.P, Whitehead K.E, Union Oil Company, World Petroleum Congress (11th. : 1983 : London), McArthur D.P, Whitehead K.E and Union Oil Company.Upgrading of petroleum residues, bitumen, and shale oil. : .

Harvard

Alley S., McArthur D., Whitehead K., Union Oil Company, World Petroleum Congress (11th. : 1983 : London), McArthur D., Whitehead K. and Union Oil Company.Upgrading of petroleum residues, bitumen, and shale oil. : .

MLA

Alley S.K, McArthur D.P, Whitehead K.E, Union Oil Company, World Petroleum Congress (11th. : 1983 : London), McArthur D.P, Whitehead K.E and Union Oil Company.: . .