Cita APA (7th ed.)

Krumm, R. (1990). The A.B.C.'s of WordPerfect 5.1. Sybex.

Cita Chicago (17th ed.)

Krumm, Rob. The A.B.C.'s of WordPerfect 5.1. San Francisco: Sybex, 1990.

Cita MLA (9th ed.)

Krumm, Rob. The A.B.C.'s of WordPerfect 5.1. Sybex, 1990.