Cita APA (7a ed.)

Hildebrandt, R., & Koetter, P. (2005). The book of Postfix: State-of-the-art message transport. No Starch Press.

Cita Chicago Style (17a ed.)

Hildebrandt, Ralf, y Patrick Koetter. The Book of Postfix: State-of-the-art Message Transport. San Francisco: No Starch Press, 2005.

Cita MLA (8a ed.)

Hildebrandt, Ralf, y Patrick Koetter. The Book of Postfix: State-of-the-art Message Transport. No Starch Press, 2005.