@book{knuth:texbook,
   author = {Knuth, D. E.},
   title = {The \TeX{}book},
   series = {Computers and Typesetting},
   volume = {A},
   publisher = {Addison Wesley},
   address = {Boston},
   year = {1986}
}
@misc{beebe:mf,
	author = {Beebe, N. H. F.},
	title = {Metafont},
	year = {2006},
	howpublished = {\url{http://www.math.utah.edu/~beebe/fonts/metafont.html}}
}
@techreport{hobby:user,
	author = {Hobby, J. D.},
	title = {A User's Manual for {\MP{}}},
	series={Computing Science Technical Report},
	number={162},
	institution={AT\&T Bell Laboratories},
	address={Murray Hill, New Jersey},
	year={1992},
	note={Also available at \url{http://www.tug.org/docs/metapost/mpman.pdf}}
}
@techreport{hobby:graph,
	author = {Hobby, J. D.},
	title = {Drawing Graphs with {\MP{}}},
	series={Computing Science Technical Report},
	number={164},
	institution={AT\&T Bell Laboratories},
	address={Murray Hill, New Jersey},
	year={1992},
	note={Also available at \url{http://www.tug.org/docs/metapost/mpgraph.pdf}}
}