ebrary, Inc. (2008). Study guide for the professional licensure of mining and mineral processing engineers: Principles and practice of engineering (P.E.) examination (7th ed.). Society for Mining Metallurgy and Exploration.
芝加哥风格引文ebrary, Inc. Study Guide for the Professional Licensure of Mining and Mineral Processing Engineers: Principles and Practice of Engineering (P.E.) Examination. 7th ed. Littleton: Society for Mining Metallurgy and Exploration, 2008.
MLA引文ebrary, Inc. Study Guide for the Professional Licensure of Mining and Mineral Processing Engineers: Principles and Practice of Engineering (P.E.) Examination. 7th ed. Society for Mining Metallurgy and Exploration, 2008.
警告：这些引文格式不一定是100％准确.