Gaya APA

Service, P, E., Contra, I, A, O, D. (1977). Lessons in rotary drilling. unit V lesson 1. wind, waves, and weather. (1977). : Texas: Petroleum Extension Service, (PETEX) ,.

Gaya MLA

Service, Petroleum, Extension., Contra, Inter., Ass., Of, Drilling. "Lessons in rotary drilling. unit V lesson 1. wind, waves, and weather.". 1977 : Texas: Petroleum Extension Service, (PETEX) ,, 1977. Text.