APA (7th ed.) Citation

North American Telephone Association. Telecommunications sourcebook. North American Telephone Association.

Chicago Style (17th ed.) Citation

North American Telephone Association. Telecommunications Sourcebook. [Washington, D.C.]: North American Telephone Association.

MLA (9th ed.) Citation

North American Telephone Association. Telecommunications Sourcebook. North American Telephone Association.

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