@Book{abramowitz+stegun,
  author =	 "Milton Abramowitz and Irene A. Stegun",
  title = 	 "Handbook of Mathematical Functions with
                  Formulas, Graphs, and Mathematical Tables",
  publisher = 	 "Dover",
  year = 	 1964,
  address =	 "New York",
  edition =	 "ninth Dover printing, tenth GPO printing"
}

@Book{HPL2000,
  editor =	 {John D. Barnsford and Ann L. Brown and Rodney R. Cocking},
  title = 	 {{How people learn: Brain, mind, experience, and school}},
  publisher = 	 {National Academy Press},
  year = 	 2000,
  address =	 {Washington, DC},
  edition =	 {expanded},
  url =		 {http://www.nap.edu/}
}