S/NNAMEURL
1PDF Drivehttp://www.pdfdrive.net
2Z Libraryhttp://z-lib.org
3PubMedhttp://www.pubmedcentral.nih.gov
8Biomed Central https://www.biomedcentral.com  
9African Journal Online (AJOL) http://www.ajol.info 
10JSTORhttp://www.jstor.com
11Directory of Open Access Journals (DOAJD)http://www.doaj.com
 PDF Drivehttp://www.pdfdrive.net
 JSSCIhttps://jssci.org/
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