{{sfn|Josephsen|2007|p=}} * {{cite book | last=Josephsen | first=David | title=Building a monitoring infrastructure with Nagios | publisher=Prentice Hall | publication-place=Upper Saddle River, N.J | date=2007 | isbn=0-13-223693-1}}

<ref name="s180">{{cite book | last=Josephsen | first=David | title=Building a monitoring infrastructure with Nagios | publisher=Prentice Hall | publication-place=Upper Saddle River, N.J | date=2007 | isbn=0-13-223693-1 | page=}}</ref>