[1]

Reid, Allan. WAN Technologies CCNA 4 Companion Guide (Cisco Networking Academy Program) (Companion Guide). Cisco Press, 2006 BiBTeX

@book{Reid:2006:4,
    author = {Reid, Allan},
    publisher = {Cisco Press},
    title = {WAN Technologies CCNA 4 Companion Guide (Cisco Networking Academy Program) (Companion Guide)},
    year = {2006},
}

[2]

Lewis, Wayne. Switching Basics and Intermediate Routing CCNA 3 Companion Guide (Cisco Networking Academy Program) (Companion Guide). Cisco Press, 2006 BiBTeX

@book{Lewis:2006:3,
    author = {Lewis, Wayne},
    publisher = {Cisco Press},
    title = {Switching Basics and Intermediate Routing CCNA 3 Companion Guide (Cisco Networking Academy Program) (Companion Guide)},
    year = {2006},
}

[3]

Odom, Wendell, and McDonald, Rick. Routers and Routing Basics CCNA 2 Companion Guide (Cisco Networking Academy Program) (Companion Guide). Cisco Press, 2006 BiBTeX

@book{Odom:2006:2,
    author = {Odom, Wendell, and McDonald, Rick},
    publisher = {Cisco Press},
    title = {Routers and Routing Basics CCNA 2 Companion Guide (Cisco Networking Academy Program) (Companion Guide)},
    year = {2006},
}

[4]

Odom, Wendell, and Knott, Thomas. Networking Basics CCNA 1 Companion Guide (Cisco Networking Academy Program) (Companion Guide). Cisco Press, 2006 BiBTeX

@book{Odom:2006:1,
    author = {Odom, Wendell, and Knott, Thomas},
    publisher = {Cisco Press},
    title = {Networking Basics CCNA 1 Companion Guide (Cisco Networking Academy Program) (Companion Guide)},
    year = {2006},
}

Bibliography