Dear Mona

I use EndNoteX7 which is good for both Windows and Mac.

Also you can use EndNote Web.

BR

Dear Dr. Sepehrimanesh,

Thank you very much for your time!

Mendeley is a good choice that is free to use. It's also constantly churning out updates and is actively collaborating with other software for researchers (e.g. SciFlow, online text editor for researchers) to make writing research papers an easier task.

You can check out Mendeley at: https://www.sciflow.net

SciFlow can be found at https://www.sciflow.net

Best regards,

Carsten