Gaya APA

Service, P, E. (1971). Lessons in well servicing and workover lesson 8. well cleanout and repair methods. (1971). : Texas : Petroleum Extension Service,.

Gaya MLA

Service, Petroleum, Extension. "Lessons in well servicing and workover lesson 8. well cleanout and repair methods.". 1971 : Texas : Petroleum Extension Service,, 1971. Text.