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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)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.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)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.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.