PowerDNS
Alternative DNS Servers: Choice and Deployment, and Optional SQL/LDAP Back-Ends (Paperback). UIT Cambridge Ltd.. pp. 114. ISBN 978-0-9544529-9-5
↑ “About”. PowerDNS. PowerDNS.COM BV (n.d.). 2019年1月24日閲覧。 “"PowerDNS was launched in 1999"; "Originally closed source"; "In 2002, all PowerDNS software was released as open source"”
↑ “PowerDNS Recursor”. Doc.powerdns.com. 2014年5月11日閲覧。
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