Held, G. (2002). Understanding data communications (7th ed.). Addison-Wesley, ; Pearson Education.
芝加哥风格引文Held, Gilbert. Understanding Data Communications. 7th ed. Boston : New Delhi: Addison-Wesley, ; Pearson Education, 2002.
MLA引文Held, Gilbert. Understanding Data Communications. 7th ed. Addison-Wesley, ; Pearson Education, 2002.
警告：这些引文格式不一定是100％准确.