Cita APA (7th ed.)

Harris, R. W. (1990). DOS, Word perfect & Lotus office companion. Global Pub.

Cita Chicago (17th ed.)

Harris, Robert W. DOS, Word Perfect & Lotus Office Companion. Manila: Global Pub, 1990.

Cita MLA (9th ed.)

Harris, Robert W. DOS, Word Perfect & Lotus Office Companion. Global Pub, 1990.