Cita APA (7th ed.)

(1993). TEACHES OS/2 2.1. ZIFF DAVIS PRESS.

Cita Chicago (17th ed.)

TEACHES OS/2 2.1. EMERYVILLS: ZIFF DAVIS PRESS, 1993.

Cita MLA (9th ed.)

TEACHES OS/2 2.1. ZIFF DAVIS PRESS, 1993.