McKenzie, G. D., & O. Utgard, R. (1975). Man and his physical environment: Readings in environmental geology (Second edition.). Burgess Publishing Company.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)McKenzie, Garry D., و Russell O. Utgard. Man and His Physical Environment: Readings in Environmental Geology. Second edition. Minneapolis: Burgess Publishing Company, 1975.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)McKenzie, Garry D., و Russell O. Utgard. Man and His Physical Environment: Readings in Environmental Geology. Second edition. Burgess Publishing Company, 1975.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.