The western heritage - Kagan, Donald (Prentice Hall, 2002)
Requisitos del sistema del material complementario: Pentiumš processor-based personal computer with CD-ROM drive ; Microsoft Windows 95, Windows 98, or Windows NT 4.0 with Service Pack 3 or later ; Internet Access and Web browser ; 10 MB of available RAM on Windows 95 and Windows 98 (24 MB recommended) ; 16 MB of available RAM on Windows NT (32 MB recommended) ; 10 MB of available hard-disk space