Hartwigsen, G. L. (1980). Design concepts: A basic guidebook. Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Hartwigsen, Gail Lynn. Design Concepts: A Basic Guidebook. Boston: Allyn and Bacon, 1980.
Lua MLA (9ú heag.)Hartwigsen, Gail Lynn. Design Concepts: A Basic Guidebook. Allyn and Bacon, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.