Gaya APA

Service, P, E., Contra, I, A, O, D. (1978). Lessons in rotary drilling. unit V lesson 9. life offshore. (1978). : Texas : Petroleum Extension Service,.

Gaya MLA

Service, Petroleum, Extension., Contra, Inter., Ass., Of, Drilling. "Lessons in rotary drilling. unit V lesson 9. life offshore.". 1978 : Texas : Petroleum Extension Service,, 1978. Text.