Nelson, G. (1965). Problems of design (2nd ed.). New York, N. Y.: Whitney Library of Design.
Παραπομπή Chicago StyleNelson, George. Problems of Design. 2nd ed. New York, N. Y.: Whitney Library of Design, 1965.
Παραπομπή MLANelson, George. Problems of Design. 2nd ed. New York, N. Y.: Whitney Library of Design, 1965.
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