APA-Zitierstil (7. Ausg.)

Frey, D. (1993). !%: : a directory of electronic mail addressing and networks (3. ed.). O'Reilly.

Chicago-Zitierstil (17. Ausg.)

Frey, Donnalyn. !%: : A Directory of Electronic Mail Addressing and Networks. 3. ed. Sebastopol, Calif: O'Reilly, 1993.

MLA-Zitierstil (9. Ausg.)

Frey, Donnalyn. !%: : A Directory of Electronic Mail Addressing and Networks. 3. ed. O'Reilly, 1993.