Gaya APA
Campbell, J, M. (1988).
GAS CONDITIONING AND PROCESSING Vol. 1 The Basic Principles .
U.S.A:
campbell petroum series.
Gaya MLA
Campbell, John, M.
"GAS CONDITIONING AND PROCESSING Vol. 1 The Basic Principles".
U.S.A:
campbell petroum series,
1988.
Text.