APA (7th ed.) Citation

Costales, B., & Allman, E. (1997). Sendmail (2nd ed.). O'Reilly & Associates, Inc.

Chicago Style (17th ed.) Citation

Costales, Bryan, and Eric Allman. Sendmail. 2nd ed. Sebastopol, Calif: O'Reilly & Associates, Inc, 1997.

MLA (9th ed.) Citation

Costales, Bryan, and Eric Allman. Sendmail. 2nd ed. O'Reilly & Associates, Inc, 1997.

Warning: These citations may not always be 100% accurate.