Gaya APA
Service., P, E. (1966).
Lessons in Rotary Drilling; unit I-Lesson 2; the bit .
Austin,Texas,USA:
Dallas : Action Systems Inc,.
Gaya MLA
Service., Petroleum, Extension.
"Lessons in Rotary Drilling; unit I-Lesson 2; the bit".
Austin,Texas,USA:
Dallas : Action Systems Inc,,
1966.
Text.