The Modular Forms Database: Bibtex Entry

\bibitem[Ste12]{mfd}
William Stein, \emph{The {M}odular {F}orms {D}atabase},
  \newline\url{http://wstein.org/Tables}.

@Article{  mfd,
	author = {Stein, William},
	title  = {The {M}odular {F}orms {D}atabase},
        note   = {\newline\url{http://wstein.org/Tables}},
	year   = 2012
}