Open-source National and International Digital Library and Research Article

  National Academic Digital Library of Ethiopia --------------------------------------> http://ndl.ethernet.edu.et/

 Springer Nature -------------------------------------------------------------------------------->https://link.springer.com/

Annual Review ----------------------------------------------------------------------------------->http://www.annualreviews.org/

Canadian Science Publishing----------------------------------------------------------------> http://www.nrcresearchpress.com/

Digital Library of international Research ----------------------------------------------->http://www.dlir.org/