Cita APA (7a ed.)

Langer, M. (2001). MAC OS 9.1. Peachpit.

Cita Chicago Style (17a ed.)

Langer, Maria. MAC OS 9.1. Berkeley: Peachpit, 2001.

Cita MLA (8a ed.)

Langer, Maria. MAC OS 9.1. Peachpit, 2001.