APA (7th ed.) Citation

Helgert, H. J. (1991). Integrated services digital networks: Architectures, protocols, standards. Addison-Wesley.

Chicago Style (17th ed.) Citation

Helgert, Hermann J. Integrated Services Digital Networks: Architectures, Protocols, Standards. Reading, Mass: Addison-Wesley, 1991.

MLA (9th ed.) Citation

Helgert, Hermann J. Integrated Services Digital Networks: Architectures, Protocols, Standards. Addison-Wesley, 1991.