APA (7e ed.) Bronvermelding

Não informado. Drilling mud. National Lead, Baroid Sales Division.

Chicago (17e ed.) Bronvermelding

Não informado. Drilling Mud. Houston, Tex: National Lead, Baroid Sales Division.

MLA (8e ed.) Bronvermelding

Não informado. Drilling Mud. National Lead, Baroid Sales Division.

Let op: Deze citaties zijn niet altijd 100% accuraat.