American Institute of Mining, Metallurgical, and Petroleum Engineers. Minnesota Section, University of Minnesota, Mining Symposium, Pfleider, E. P., & Berger, F. E. (1966). 27th Annual meeting of the Minnesota Section, AIME, and 39th annual Mining Symposium, January 10-12, 1966, Duluth, Minnesota: [proceedings]. University of Minnesota.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)American Institute of Mining, Metallurgical, and Petroleum Engineers. Minnesota Section, University of Minnesota, Mining Symposium, Eugene P. Pfleider, و Fred E. Berger. 27th Annual Meeting of the Minnesota Section, AIME, and 39th Annual Mining Symposium, January 10-12, 1966, Duluth, Minnesota: [proceedings]. Minneapolis: University of Minnesota, 1966.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)American Institute of Mining, Metallurgical, and Petroleum Engineers. Minnesota Section, et al. 27th Annual Meeting of the Minnesota Section, AIME, and 39th Annual Mining Symposium, January 10-12, 1966, Duluth, Minnesota: [proceedings]. University of Minnesota, 1966.