Παραπομπή APA

Cisco Systems, I., & Cisco Networking Academy Program. (2003). Cisco Networking Academy Program: CCNA 3 and 4 companion guide (3rd ed.). Indianapolis, Ind.: Cisco.

Παραπομπή Chicago Style

Cisco Systems, Inc., and Cisco Networking Academy Program. Cisco Networking Academy Program: CCNA 3 and 4 Companion Guide. 3rd ed. Indianapolis, Ind.: Cisco, 2003.

Παραπομπή MLA

Cisco Systems, Inc., and Cisco Networking Academy Program. Cisco Networking Academy Program: CCNA 3 and 4 Companion Guide. 3rd ed. Indianapolis, Ind.: Cisco, 2003.

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