?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Nelson%2C+R.R.&rft.aulast=Nelson&rft.aufirst=R.R.&rft.date=1996&rft.isbn=9780674001725&rft.btitle=The+Sources+of+Economic+Growth&rft.genre=book