胡卡比 & 加诺. (2013). CCNP安全防火墙642-618认证考试指南: CCNP security FIREWALL 642-618 of ficial cert guide. 人民邮电出版社.
Dyfyniad Arddull Chicago胡卡比 and 加诺. CCNP安全防火墙642-618认证考试指南: CCNP Security FIREWALL 642-618 of Ficial Cert Guide. 人民邮电出版社, 2013.
Dyfyniad MLA胡卡比 and 加诺. CCNP安全防火墙642-618认证考试指南: CCNP Security FIREWALL 642-618 of Ficial Cert Guide. 人民邮电出版社, 2013.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.