Lansford L. Lewis. (2011). Oil and Gas 1: Teacher's Resource Book. New York, Oxford University Press, 2011.
Lua i Stíl Chicago (17ú heag.)Lansford L. Lewis. Oil and Gas 1: Teacher's Resource Book. New York, Oxford University Press, 2011, 2011.
Lua MLA (9ú heag.)Lansford L. Lewis. Oil and Gas 1: Teacher's Resource Book. New York, Oxford University Press, 2011, 2011.
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