Não informado. (1944). Drilling contractor. American Association of Oilwell Drilling Contractors.
Style de citation Chicago (17e éd.)Não informado. Drilling Contractor. Dallas, Tex: American Association of Oilwell Drilling Contractors, 1944.
Style de citation MLA (8e éd.)Não informado. Drilling Contractor. American Association of Oilwell Drilling Contractors, 1944.
Attention : ces citations peuvent ne pas être correctes à 100%.