Gaya APA

Service, P, E., Contra, I, A, O, D. (1965). Lessons in rotary drilling. unit I lesson 3. the drill string. (1965). : Texas :Petroleum Extension Service,.

Gaya MLA

Service, Petroleum, Extension., Contra, Inter., Ass., Of, Drilling. "Lessons in rotary drilling. unit I lesson 3. the drill string.". 1965 : Texas :Petroleum Extension Service,, 1965. Text.