Cita APA (7a ed.)

Costales, B., & Allman, E. (1997). Sendmail (Second revised and updated edition.). O'Reilly; Shroff Publishers & Distributors PVT.LTD..

Cita Chicago Style (17a ed.)

Costales, Bryan, y Eric Allman. Sendmail. Second revised and updated edition. Beijing ; Sebastopol, CA : Mumbai ; Calcutta: O'Reilly; Shroff Publishers & Distributors PVT.LTD., 1997.

Cita MLA (8a ed.)

Costales, Bryan, y Eric Allman. Sendmail. Second revised and updated edition. O'Reilly; Shroff Publishers & Distributors PVT.LTD., 1997.