Não informado. Drilling mud. National Lead, Baroid Sales Division.
Style de citation Chicago (17e éd.)Não informado. Drilling Mud. Houston, Tex: National Lead, Baroid Sales Division.
Style de citation MLA (8e éd.)Não informado. Drilling Mud. National Lead, Baroid Sales Division.
Attention : ces citations peuvent ne pas être correctes à 100%.