APA Style
Service, P, E. (1980).
Lessons in Well Servicing and Workover: Lesson 7 – Well Servicing and Repair .
Texas:
Petroleum Extension Service.
MLA Style
Service, Petroleum, Extension.
"Lessons in Well Servicing and Workover: Lesson 7 – Well Servicing and Repair".
Texas:
Petroleum Extension Service,
1980.
Teknik.