APA
Ion D., Ross R. & Mortimer G. W.Oil and gas. [s.l.]: [s.n.].
Chicago
Ion D.C, Ross R.J.P and Mortimer Glenn W.Oil and gas. [s.l.]: [s.n.].
Harvard
Ion D., Ross R. and Mortimer G. W.Oil and gas. [s.l.]: [s.n.].
MLA
Ion D.C, Ross R.J.P and Mortimer Glenn W.[s.l.]: [s.n.]. .
