This document lists 8 sources that were referenced in the paper. The sources include books, blogs, and websites on topics such as administering Linux servers and routers, configuring PPPoE clients and servers on Mikrotik routers, installing VMWare vSphere, configuring router-on-a-stick with Mikrotik, setting up Asterisk extensions, and installing and configuring Asterisk on Ubuntu for VoIP. The sources are cited in APA format and include publication dates ranging from 2011 to 2014.