Nielsen., N. (1958). Vernor C. Finch, Glenn T. Trewartha, Arthur H. Robinson & Edwin H. Hammond: Elements of Geography. 4. udg. 693 s. 25 X 18 cm. McGraw-Hill, New York 1957. Geografisk Tidsskrift - Danish Journal of Geography, 57. Retrieved from https://tidsskrift.dk/geografisktidsskrift/article/view/46380