Gaya APA

Services., P, E., Cont, A, A, O, O, D. (1965). Lessons in rotary drilling. unit I lesson 4. The rotating components : rotary, kelly and swivel. (1965). : Texas : Petroleum Extension Service,.

Gaya MLA

Services., Petroleum, Extension., Cont, Ame., Ass., Of, Oilwell, Dril. "Lessons in rotary drilling. unit I lesson 4. The rotating components : rotary, kelly and swivel.". 1965 : Texas : Petroleum Extension Service,, 1965. Text.