APA (7th ed.) Citation

National Petroleum Refiners Association & National Petroleum Refiners Association. NPRA question & answer session on refining technology. Petroleum Publishing Co.

Chicago Style (17th ed.) Citation

National Petroleum Refiners Association and National Petroleum Refiners Association. NPRA Question & Answer Session on Refining Technology. Tulsa, Okla.: Petroleum Publishing Co.

MLA (9th ed.) Citation

National Petroleum Refiners Association and National Petroleum Refiners Association. NPRA Question & Answer Session on Refining Technology. Petroleum Publishing Co.

Warning: These citations may not always be 100% accurate.