Laisvos prieigos duomenų bazės
http://www.doaj.org
https://www.doabooks.org
http://scholar.google.lt
http://www.tandfonline.com/page/openaccess/openjournals
http://www.wileyopenaccess.com/view/journals.html
https://www.epaveldas.lt/main
http://ebooks.mruni.eu
http://www.encyclopedia.com
https://english-military-dictionary.org.ua/
http://www.scienceresearch.com