?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Efron%2C+Bradley&rft.aulast=Efron&rft.aufirst=Bradley&rft.date=May+1994&rft.isbn=9780412042317&rft.btitle=An+Introduction+to+the+Bootstrap&rft.tpages=456&rft.genre=book