APA (7th ed.) Citation

Costales, B., Allman, E., & Rickert, N. (1993). Sendmail (1. ed.). O'Reilly.

Chicago Style (17th ed.) Citation

Costales, Bryan, Eric Allman, and Neil Rickert. Sendmail. 1. ed. Sebastopol, Calif: O'Reilly, 1993.

MLA (9th ed.) Citation

Costales, Bryan, et al. Sendmail. 1. ed. O'Reilly, 1993.