the Australian Agricultural Economic Society, 1989
Majalah, Jurnal, Buletin
Norton, George W., author
McGraw-Hill, 1993
Buku Teks
Mellor, John W., author
Cornell University Press, 1966
Buku Teks
Cramer, Gail L., author
John Wiley & Sons, 1979
Buku Teks
Thomson, Edgar
Thomson Nelson and Sons Ltd. , 1949
Buku Teks