Shelly, G. B., & Cashman, T. J. (1991). Systems analysis and design. Boyd & Fraser.
Lua i Stíl Chicago (17ú heag.)Shelly, Gary B., agus Thomas J. Cashman. Systems Analysis and Design. Boston: Boyd & Fraser, 1991.
Lua MLA (9ú heag.)Shelly, Gary B., agus Thomas J. Cashman. Systems Analysis and Design. Boyd & Fraser, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.