Cita APA (7a ed.)

Krumm, R. (1988). Wordperfect 4.2. McGraw-Hill.

Cita Chicago Style (17a ed.)

Krumm, Rob. Wordperfect 4.2. Madrid [etc.]: McGraw-Hill, 1988.

Cita MLA (9a ed.)

Krumm, Rob. Wordperfect 4.2. McGraw-Hill, 1988.