Van den Berg, Hendrik, 1949-, author
NJ World Scientific, 2011
Buku Teks
Kuznets, Simon Smith, 1901-, author
W.W. Norton&Company-Inc, 1965
Buku Teks
McMichael, Philip, 1947-, author
Sage, 2012
Buku Teks
McMichael, Philip, 1947-, author
Pine Forge Press, 2000
Buku Teks
Meier, Gerald M., author
Wiley, 1966
Buku Teks