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I have my references.bib file ready (my main document class is article)
Some of my references are web pages (@misc) and most are scientific papers (@article). If I want the articles to be tagged [1], [2]... etc and the misc to be tagged [i], [ii]... etc, how would I go about doing that?
\documentclass{article}
\begin{document}
\cite{NSF_1}
\bibliographystyle{unsrt}
\bibliography{references}
\end{document}
This is fairly easy with biblatex (biblatex in a nutshell (for beginners)). In the MWE we filter @online entries and give them Roman numerals. All other entries get Arabic numbers. resetnumbers makes sure that the numbering of the @online entries starts with 'i' again and does not continue where the previous list left off (i.e. with 'iv'). defernumbers is needed when using resetnumbers.
\documentclass{article}
\usepackage[style=numeric, backend=biber, defernumbers=true]{biblatex}
\addbibresource{biblatex-examples.bib}
\DeclareFieldFormat{labelnumber}{\ifentrytype{online}{\Rn{#1}}{#1}}
\begin{document}
\cite{markey,sigfridsson,wassenberg,baez/online,ctan,worman,nussbaum}
\printbibliography[nottype=online]
\printbibliography[title={Online Sources}, type=online, resetnumbers]
\end{document}
biblatexas your tags suggest? Or do you usenatbibor another bibliography package?biblatexis a package you need to load explicitly. The built-in solution isthebibliography? Can you show an MWE/MWEB of how you create your bibliography at the moment? You might want to read an introduction to bibliographies in TeX: en.wikibooks.org/wiki/LaTeX/Bibliography_Managementbiblatex. You are using BibTeX. You could switch tobiblatexto use my answer below (see tex.stackexchange.com/q/13509/35864 and linked questions for help). If you insist on an answer that works with BibTeX andunsrtyou might want to add that to your question.