Gaya APA

Service, P, E., Contra, I, A, O, D. (1976). Lessons in rotary drilling. unit V lesson 4. jacking systems and rig moving procedures. (1976). : Texas: Petroleum Extension Service, (PETEX).

Gaya MLA

Service, Petroleum, Extension., Contra, Inter., Ass., Of, Drilling. "Lessons in rotary drilling. unit V lesson 4. jacking systems and rig moving procedures.". 1976 : Texas: Petroleum Extension Service, (PETEX), 1976. Text.