Mining Symposium Duluth, Minn, University of Minnesota, Duluth Branch, American Institute of Mining and Metallurgical Engineers. Minnesota Section. Meeting, Pfleider, E. P., & Anderson, A. E. (1962). Twenty-third annual mining symposium and the annual meeting of the Minnesota Section, AIME, January 15-17, 1962, Duluth, Minnesota. University of Minnesota.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMining Symposium Duluth, Minn, Duluth Branch University of Minnesota, American Institute of Mining and Metallurgical Engineers. Minnesota Section. Meeting, Eugene P. Pfleider, और Arthur E. Anderson. Twenty-third Annual Mining Symposium and the Annual Meeting of the Minnesota Section, AIME, January 15-17, 1962, Duluth, Minnesota. Minneapolis: University of Minnesota, 1962.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMining Symposium Duluth, Minn, et al. Twenty-third Annual Mining Symposium and the Annual Meeting of the Minnesota Section, AIME, January 15-17, 1962, Duluth, Minnesota. University of Minnesota, 1962.