Gaya APA

Services, P, E, ., IADC, . (1982). Lessons in rotary drilling. Unit 1 Lesson 12. mud pumps and conditioning equipment. (1982). : Austin : Petroleum Extens. Services, (PETEX),.

Gaya MLA

Services, Petroleum, Extension, ., IADC, . "Lessons in rotary drilling. Unit 1 Lesson 12. mud pumps and conditioning equipment.". 1982 : Austin : Petroleum Extens. Services, (PETEX),, 1982. Text.