Gaya APA

Service, P, E., AAODC., . (1969). Lessons in rotary drilling. Unit III Lesson 3. blowout prevention (1969). : Texas : Petroleum Extension Service,.

Gaya MLA

Service, Petroleum, Extension., AAODC., . "Lessons in rotary drilling. Unit III Lesson 3. blowout prevention". 1969 : Texas : Petroleum Extension Service,, 1969. Text.