Held, G. (1996). Understanding Data communications (4th.). P H I.
Chicago-čujuhus (17. p.)Held, Gilbert. Understanding Data Communications. 4th. New Delhi: P H I, 1996.
MLA-čujuhus (9. p.)Held, Gilbert. Understanding Data Communications. 4th. P H I, 1996.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.