APA (7th ed.) Citation

Costales, B., & Allman, E. (2003). Sendmail (3. ed., rev. & updated.). O'Reilly.

Chicago Style (17th ed.) Citation

Costales, Bryan, and Eric Allman. Sendmail. 3. ed., rev. & updated. Beijing [u.a.]: O'Reilly, 2003.

MLA (9th ed.) Citation

Costales, Bryan, and Eric Allman. Sendmail. 3. ed., rev. & updated. O'Reilly, 2003.