I am new to LaTeX and I managed to add references to a document with natbib however when I preview it, the reference colour in the brackets appears to be in green colour. Everything else is fine. Would it still be green when I print it out? Or is this just a convenient built-in feature? How can I make it into black either way if I find this annoying? I am attaching a picture to show u what I mean.

\hypersetup{hidelinks}in your preamble. – Johannes_B Jun 02 '15 at 16:14citecoloris what you want to change. See thehyperrefmanual, section 3, for more information. I like to just make the colors darker this way; the color-coding does help me. If you make the colors dark enough, they won't be easily-noticed when printed. – Sean Allred Jun 02 '15 at 17:07