APA (7th ed.) Citation

HeldlhGilbert. Understanding data communications: From fundamentals to networking.

Chicago Style (17th ed.) Citation

HeldlhGilbert. Understanding Data Communications: From Fundamentals to Networking. New YorklbJohn Wiley & Sonslc1991.

MLA (9th ed.) Citation

HeldlhGilbert. Understanding Data Communications: From Fundamentals to Networking.

Warning: These citations may not always be 100% accurate.