Leffler, W. L., & Leffler, W. L. (1979). Petroleum refining for the non-technical person. Tulsa, Okla.: PennWell Books.
Chicago Style CitationLeffler, William L., and William L. Leffler. Petroleum Refining for the Non-technical Person. Tulsa, Okla.: PennWell Books, 1979.
MLA CitationLeffler, William L., and William L. Leffler. Petroleum Refining for the Non-technical Person. Tulsa, Okla.: PennWell Books, 1979.
Warning: These citations may not always be 100% accurate.