Edwards, P. (1993). Systems analysis & design. Mitchell McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Edwards, Perry. Systems Analysis & Design. New York: Mitchell McGraw-Hill, 1993.
Lua MLA (9ú heag.)Edwards, Perry. Systems Analysis & Design. Mitchell McGraw-Hill, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.