Pohan, Hazairin, author
Jurnal Kajian Wilayah Eropa, 2008
Artikel Jurnal
B. Blackwell for the United Nations Industrial Development Organization, 1991
Buku Teks
The World Bank, 1995
Buku Teks
The Goverment Information Office, 2009
Buku Referensi
Wenner-Gren Foundation for anthropological research, 1955
Buku Teks