The Modular Forms Database: Bibtex Entry

\bibitem[Ste04]{mfd}
 W. Stein, \emph{The {M}odular {F}orms {D}atabase}, 
      \newline{\tt http://modular.fas.harvard.edu/Tables} (2004).

@article{mfd,
     AUTHOR = {Stein, W.},
     TITLE = {The {M}odular {F}orms {D}atabase},
     YEAR = {2004},
     JOURNAL = {\newline{\tt http://modular.fas.harvard.edu/Tables}}
}