STEINFELD EDWARD. (2012). UNIVERSAL DESIGN. JOHN WILEY AND SONS INC/NEW JERSEY.
Lua i Stíl Chicago (17ú heag.)STEINFELD EDWARD. UNIVERSAL DESIGN. JOHN WILEY AND SONS INC/NEW JERSEY, 2012.
Lua MLA (9ú heag.)STEINFELD EDWARD. UNIVERSAL DESIGN. JOHN WILEY AND SONS INC/NEW JERSEY, 2012.
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