Gaya APA

Services., P, E., Cont, A, A, O, O, D. (1966). Lessons in rotary drilling. unit I lesson 6. the hoist. (1966). : Texas : Petroleum Extension Service,.

Gaya MLA

Services., Petroleum, Extension., Cont, Ame., Ass., Of, Oilwell, Dril. "Lessons in rotary drilling. unit I lesson 6. the hoist.". 1966 : Texas : Petroleum Extension Service,, 1966. Text.