edited by Karl Shell
MIT Press, 1967
Buku Teks
Kuznets, Simon Smith, 1901-
W.W. Norton&Company-Inc, 1965
Buku Teks
Fogel, Robert William
Johns Hopkins Press, 1964
Buku Teks
Spulber, Nicolas
Indiana Univeristy Press , 1965
Buku Teks
Assheton, Richard
University press, 2014
Buku Teks