Gaya APA

refiners, N, P. (1972). 1971 NPRA QUESTION & ANSWER SESSIONS ON REFINING TECHNOLOGY & COMPUTER APPLICATIONS . : Tulsa : Petroleum Publishing Company,.

Gaya MLA

refiners, National, Petroleum. "1971 NPRA QUESTION & ANSWER SESSIONS ON REFINING TECHNOLOGY & COMPUTER APPLICATIONS". : Tulsa : Petroleum Publishing Company,, 1972. Text.