Ziegler, R. L. (2000). Linux Firewalls. Indianapolis, Ind: New Riders.
Trích dẫn kiểu ChicagoZiegler, Robert L. Linux Firewalls. Indianapolis, Ind: New Riders, 2000.
MLA引文Ziegler, Robert L. Linux Firewalls. Indianapolis, Ind: New Riders, 2000.
警告：這些引文格式不一定是100％准確.