Choosing the Right Citation Manager:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6013132/
Zotero 5.0 vs. EndNoteX8-X9:
https://guides.library.brandeis.edu/c.php?g=301723&p=2013508
Advantages and limitations of Zotero:
http://zotero.pbworks.com/w/page/5511966/Advantages%20and%20Limitations%20of%20Zotero
Pros and cons of Mendeley and Zotero:
https://nakhmani.wordpress.com/2011/02/02/mendeley-vs-zotero-comparison/
Oxford lib guide comparison table:
https://libguides.bodleian.ox.ac.uk/c.php?g=423116&p=3851803
EndNote pros and cons:
https://guides.ucsf.edu/c.php?g=101034&p=654993
Zotero pros and cons:
https://guides.ucsf.edu/c.php?g=101034&p=655083
Comparison of RefWorks and Zotero:
https://www.lib.ncsu.edu/guides/zotero/zoterocomparison
RefWorks vs. Zotero:
https://libguides.rutgers.edu/c.php?g=337065&p=2268559
RefWorks vs. Zotero vs. Mendeley:
http://ru.za.libguides.com/c.php?g=174192
If you want , choose :
https://guides.ucsf.edu/referencemanagers
RefWorks vs. EndNote vs. EndNote Web vs. Zotero: