Databases - PSBUUM - Page 2

sciencedirect

Popular

Science Direct Open Access

https://www.sciencedirect.com/browse/journals-and-books?accessType=openAccess

jstor

Popular

Open and Free Content on JSTOR and Artstor

https://about.jstor.org/oa-and-free/

nmaster

Popular

Nation Master

https://www.nationmaster.com/

ideas

Popular

IDEAS

https://ideas.repec.org/

eldis

Popular

Eldis

https://www.eldis.org/

citeseerx

Popular

CiteSeerX

https://citeseerx.ist.psu.edu/index