Die hier verfügbaren Materialien sind Open Educational Resources (Freie Bildungsmedien). \\ \\ 

[[http://www.unesco.org/new/en/communication-and-information/access-to-knowledge/open-educational-resources/|{{:oer-logo-1.png?nolink|Freie Lernmaterialien}}]]\\ 
Logo von [[http://www.unesco.org/new/en/communication-and-information/access-to-knowledge/open-educational-resources/global-oer-logo/|Jonathas Mello]], \\ [[http://creativecommons.org/licenses/by/3.0/|CC BY]]