To modify citation styles for basic bibitem citations, use the following lines in the preamble:

\makeatletter
\renewcommand*{\@biblabel}[1]{/#1/}
\renewcommand*{\@cite}[1]{/#1/}
\makeatother


The code above changes the citation marker from [n] to /n/.

To change the bibliography title, use (right before \begin{thebibliography}, especially if you’re using babel):

\renewcommand\refname{New Title}   % for article, or
\renewcommand\bibname{New Title}   % for other types

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