DART-Europe E-Theses Portal
http://www.dart-europe.eu/basic-search.php/

Greek National Archive of PhD Theses (EADD)
http://www.didaktorika.gr/eadd/?locale=en

OhioLINK Electronic Theses&Dissertations Center (ETD)
https://etd.ohiolink.edu/ap/1?0

ThesesCanada
http://amicus.collectionscanada.gc.ca/thesescanada-bin/Main/AdvSearch?coll=18&l=0&v=1

YÖK Tez Merkezi
https://tez.yok.gov.tr/UlusalTezMerkezi/giris.jsp