Kevin Wallace, C. N. 7. Cisco Voice over IP (CVOICE): Authorized Self-Study Guide (3.). Pearson India.
芝加哥风格引文Kevin Wallace, CCIE No. 7945. Cisco Voice over IP (CVOICE): Authorized Self-Study Guide. 3. Pearson India.
MLA引文Kevin Wallace, CCIE No. 7945. Cisco Voice over IP (CVOICE): Authorized Self-Study Guide. 3. Pearson India.
警告：这些引文格式不一定是100％准确.