Não informado. Drilling mud. National Lead, Baroid Sales Division.
Chicagoスタイル(17版)引用形式Não informado. Drilling Mud. Houston, Tex: National Lead, Baroid Sales Division.
MLA(8版)引用形式Não informado. Drilling Mud. National Lead, Baroid Sales Division.
警告: この引用は必ずしも正確ではありません.