Hartshorn, J. E. (1962). Oil Companies and Governments. London: Faber and Faber.
Trích dẫn kiểu ChicagoHartshorn, J. E. Oil Companies and Governments. London: Faber and Faber, 1962.
Deismireacht MLAHartshorn, J. E. Oil Companies and Governments. London: Faber and Faber, 1962.
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