Cita APA (7a ed.)

Tittel, E., & Robbins, M. (1994). E-mail essentials. AP Professional.

Cita Chicago Style (17a ed.)

Tittel, Ed, y Margaret Robbins. E-mail Essentials. Boston [etc.]: AP Professional, 1994.

Cita MLA (9a ed.)

Tittel, Ed, y Margaret Robbins. E-mail Essentials. AP Professional, 1994.