Jessup, L. M., & Valacich, J. S. (1999). Information systems foundations. Macmillam.
Lua i Stíl Chicago (17ú heag.)Jessup, Leonard M., agus Joseph S. Valacich. Information Systems Foundations. Indianapolis, IN: Macmillam, 1999.
Lua MLA (9ú heag.)Jessup, Leonard M., agus Joseph S. Valacich. Information Systems Foundations. Macmillam, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.