Ptak, C. A., & Schragenheim, E. (2004). ERP: : tools, techniques, and applications for integrating the supply chain (2nd edition.). St. Lucie Press.
Lua i Stíl Chicago (17ú heag.)Ptak, Carol A., agus Eli Schragenheim. ERP: : Tools, Techniques, and Applications for Integrating the Supply Chain. 2nd edition. Boca Raton, Fluorida: St. Lucie Press, 2004.
Lua MLA (8ú heag.)Ptak, Carol A., agus Eli Schragenheim. ERP: : Tools, Techniques, and Applications for Integrating the Supply Chain. 2nd edition. St. Lucie Press, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.