Cisco Networking Academy Program. (2001). Cisco Networking Academy Program: Second-year companion guide (Second edition.). Editorial Cisco Press.

Cisco Networking Academy Program. Cisco Networking Academy Program: Second-year Companion Guide. Second edition. Indianápolis: Editorial Cisco Press, 2001.

Cisco Networking Academy Program. Cisco Networking Academy Program: Second-year Companion Guide. Second edition. Editorial Cisco Press, 2001.