<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">Library of Congress.</hi> 2019. »Extended Date/Time Format (EDTF) Specification.« February 4, 2019. Letzter Zugriff am 15. Dezember 2022. ( <ptr xmlns="http://www.tei-c.org/ns/1.0" target="http://www.loc.gov/standards/datetime/" />)