Cita APA (7th ed.)

Krumm, R. (1990). Teach yourself -- Wordperfect 5.1 for desktop publishing. Global.

Cita Chicago (17th ed.)

Krumm, Rob. Teach Yourself -- Wordperfect 5.1 for Desktop Publishing. Manila: Global, 1990.

Cita MLA (9th ed.)

Krumm, Rob. Teach Yourself -- Wordperfect 5.1 for Desktop Publishing. Global, 1990.