Gaya APA

Service, P, E., Contra, I, A, O, D. (1983). Lessons in rotary drilling. Unit II Lesson 1. making hole. (1983). : Texas : Petroleum Extension Service (PETEX),.

Gaya MLA

Service, Petroleum, Extension., Contra, Inter., Ass., Of, Drilling. "Lessons in rotary drilling. Unit II Lesson 1. making hole.". 1983 : Texas : Petroleum Extension Service (PETEX),, 1983. Text.