Grew, E. (1995). Study of modern geology: Describing in simple but exact language the making of the earth with some account of prehistoric animal life; with twenty five illustrations. Discovery Pub..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Grew, E.S. Study of Modern Geology: Describing in Simple but Exact Language the Making of the Earth with Some Account of Prehistoric Animal Life; with Twenty Five Illustrations. New Delhi: Discovery Pub., 1995.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Grew, E.S. Study of Modern Geology: Describing in Simple but Exact Language the Making of the Earth with Some Account of Prehistoric Animal Life; with Twenty Five Illustrations. Discovery Pub., 1995.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.