Harrison, C. W. (1965). OILMEN and What They Do. New York: Franklin Watts.
Παραπομπή Chicago StyleHarrison, C. William. OILMEN and What They Do. New York: Franklin Watts, 1965.
Παραπομπή MLAHarrison, C. William. OILMEN and What They Do. New York: Franklin Watts, 1965.
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