Παραπομπή APA
Cisco Systems, I., & Cisco Networking Academy Program. (2005). Cisco Networking Academy Program: CCNA 1 and 2 companion guide (Rev. 3rd ed.). Indianapolis, Ind.: Cisco Press.
Παραπομπή Chicago StyleCisco Systems, Inc., and Cisco Networking Academy Program. Cisco Networking Academy Program: CCNA 1 and 2 Companion Guide. Rev. 3rd ed. Indianapolis, Ind.: Cisco Press, 2005.
Παραπομπή MLACisco Systems, Inc., and Cisco Networking Academy Program. Cisco Networking Academy Program: CCNA 1 and 2 Companion Guide. Rev. 3rd ed. Indianapolis, Ind.: Cisco Press, 2005.
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