McKenzie, G. D., & Utgard, R. O. Man and his physical environment: Readings in environmental geology.
Citazione stile Chigago Style (17a edizione)McKenzie, Garry D., e Russell O. Utgard. Man and His Physical Environment: Readings in Environmental Geology.
Citatione MLA (9a ed.)McKenzie, Garry D., e Russell O. Utgard. Man and His Physical Environment: Readings in Environmental Geology.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.