World atlas: The software toolworks, 1990-1992. [CD-ROM].
Cita Chicago (17th ed.)World Atlas: The Software Toolworks, 1990-1992. [CD-ROM].
Cita MLA (9th ed.)World Atlas: The Software Toolworks, 1990-1992. [CD-ROM].
Atenció: Aquestes cites poden no estar 100% correctes.