Não informado. Drilling mud. National Lead, Baroid Sales Division.
Cita Chicago Style (17a ed.)Não informado. Drilling Mud. Houston, Tex: National Lead, Baroid Sales Division.
Cita MLA (8a ed.)Não informado. Drilling Mud. National Lead, Baroid Sales Division.
Precaución: Estas citas no son 100% exactas.