HARTWIGSEN, G. L. (1980). Design Concepts A Basic Guidebook Gail Lynn Hartwigsen. Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)HARTWIGSEN, Gail Lynn. Design Concepts A Basic Guidebook Gail Lynn Hartwigsen. Allyn and Bacon, 1980.
Lua MLA (8ú heag.)HARTWIGSEN, Gail Lynn. Design Concepts A Basic Guidebook Gail Lynn Hartwigsen. Allyn and Bacon, 1980.
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