APA (7th ed.) Citation

Adams, R., & Frey, D. (1990). !%@: : A Directory of Electronic Mail Addressing and Networks (2nd ed.). O' Reilly and Associates, Inc.

Chicago Style (17th ed.) Citation

Adams, Rick, and Donnalyn Frey. !%@: : A Directory of Electronic Mail Addressing and Networks. 2nd ed. Sebastopol CA: O' Reilly and Associates, Inc, 1990.

MLA (8th ed.) Citation

Adams, Rick, and Donnalyn Frey. !%@: : A Directory of Electronic Mail Addressing and Networks. 2nd ed. O' Reilly and Associates, Inc, 1990.