(1973). Focuson environmental geology: A collection of case histories and readings from original sources. New York: Oxford University Press.
استشهاد بنمط شيكاغوFocuson Environmental Geology: A Collection of Case Histories and Readings From Original Sources. New York: Oxford University Press, 1973.
MLA استشهادFocuson Environmental Geology: A Collection of Case Histories and Readings From Original Sources. New York: Oxford University Press, 1973.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.