Langer, Maria
Quicken 2000 : the official guide
Osborne/McGraw-Hill, 1999
 Buku Referensi
Guide to official statistics
Central Statistical Office
Her Majesty`s Stationery Office, 1986
 Buku Referensi
Oehler, Karsten
IBM Cognos TM1 : the official guide
McGraw-Hill, 2012
 Buku Teks
McCracken, Daniel D.
A simplified guide to FORTRAN programming
John Wiley & Sons, 1974
 Buku Referensi
O`Donnell, Sandra Martin
Programming for the world : a guide to internationalization
Prentice-Hall, 1994
 Buku Teks SO