Nagpal, A. (2003). ALE, EDI & IDoc technologies for SAP (2nd ed.). Prentice-Hall of India.
Dyfyniad Arddull ChicagoNagpal, Arvind. ALE, EDI & IDoc Technologies for SAP. 2nd ed. New Delhi: Prentice-Hall of India, 2003.
Dyfyniad MLANagpal, Arvind. ALE, EDI & IDoc Technologies for SAP. 2nd ed. Prentice-Hall of India, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.