APA

Campbell J. M., Chairman B., The Campbell Group, Chairman B. & The Campbell Group. (1978). Gas conditioning and processing. Oklahoma: Campbell Petroleum.

Chicago

Campbell John M, Chairman Board, The Campbell Group, Chairman Board and The Campbell Group. 1978. Gas conditioning and processing. Oklahoma: Campbell Petroleum.

Harvard

Campbell J. M., Chairman B., The Campbell Group, Chairman B. and The Campbell Group. (1978). Gas conditioning and processing. Oklahoma: Campbell Petroleum.

MLA

Campbell John M, Chairman Board, The Campbell Group, Chairman Board and The Campbell Group. Gas conditioning and processing. Oklahoma: Campbell Petroleum. 1978.