No Inv.: 865/S/Perp/98/1c~107079-107081/S/Perp/06/3c
No Inv.: 78742/01/1c
No Inv.: 88065-88074/P/Perp/04/10c~114238/P/Perp/08/1c
No Inv.: 111575-111577/P/Perp/07/3c
Bibliografi : hlm. 170-172
No Inv.: 877/S/Perp/92/1c~115072/S/Perp/08/1c
No Inv.: 297/S/Perp/91/1c
No Inv.: 9385-9389/P/Perp/92/5c
Judul asli :"The Essence of information systems"
No Inv.: 86789-86791/P/Perp/03/3c~114433-114437/P/Perp/08/5c~118545-118547/P/Perp/09/3c