Indonesian Agency for Agricultural Research and Development,
Majalah, Jurnal, Buletin
Herren, Ray V.
Delmar Learning , 2013
Buku Teks
the Australian Agricultural Economic Society, 1989
Majalah, Jurnal, Buletin
Muhammad Ashraf, editor
[, Springer], 2012
eBooks
Smith, Kenneth M., author
Cambridge University Press, 2013
Buku Teks