Citazione Stile APA (7a Edizione)

Held, G., & Friend, G. E. (1994). Understanding data communications (4th ed.). Jemma.

Citazione stile Chigago Style (17a edizione)

Held, Gilbert, e George E. Friend. Understanding Data Communications. 4th ed. Rizal: Jemma, 1994.

Citatione MLA (9a ed.)

Held, Gilbert, e George E. Friend. Understanding Data Communications. 4th ed. Jemma, 1994.