Gaya APA

Service, P, E. (1971). Safe handling of hydrogen sulfide gas Supplement to Safety on the rig. Unit I Lesson 10 (1971). : Texas : PES,.

Gaya MLA

Service, Petroleum, Extension. "Safe handling of hydrogen sulfide gas Supplement to Safety on the rig. Unit I Lesson 10". 1971 : Texas : PES,, 1971. Text.