<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">Miles, Alistair / Bechhofer, Sean (eds.) (2009)</hi>: <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">SKOS Simple Knowledge Organization System</hi>, W3C Recommendation, 18 August 2009, <ptr xmlns="http://www.tei-c.org/ns/1.0" target="http://www.w3.org/TR/skos-reference" />.