Gaya APA

Service, P, E., Contra, I, A, O, D. (1977). Lessons in rotary drilling. unit V lesson 6. vessel inspection and maintenance. (1977). : Texas : Petroleum Extension Service, (PETEX).

Gaya MLA

Service, Petroleum, Extension., Contra, Inter., Ass., Of, Drilling. "Lessons in rotary drilling. unit V lesson 6. vessel inspection and maintenance.". 1977 : Texas : Petroleum Extension Service, (PETEX), 1977. Text.