Hartwigsen, G. L. (1980). Design concepts: A basic guidebook. Allyn and Bacon.
Cita Chicago Style (17a ed.)Hartwigsen, Gail Lynn. Design Concepts: A Basic Guidebook. Boston: Allyn and Bacon, 1980.
Cita MLA (9a ed.)Hartwigsen, Gail Lynn. Design Concepts: A Basic Guidebook. Allyn and Bacon, 1980.
Precaución: Estas citas no son 100% exactas.