Gaya APA

Service, P, E., Contract, I, A, O, D. (1981). Principles of drilling fluid control (Twelfth Ed) (1981). : Texas : Petex,.

Gaya MLA

Service, Petroleum, Extension., Contract, Inter., Ass., Of, Drill.. "Principles of drilling fluid control (Twelfth Ed)". 1981 : Texas : Petex,, 1981. Text.