World Health Organization, 2003
Buku Teks
Pearce-Higgins, James W.
Cambridge Univ. Press, 2014
Buku Teks
Indonesian agency for agricultural research and development,
Majalah, Jurnal, Buletin
Fernando, H.J.S., editor
Springer, 2012
eBooks
Jurnal Kajian Wilayah Eropa Vol. 4 No. 1 2008: 5-20, 2008
Artikel Jurnal