Editor, L.R. Wetter, F. Constabel
ITB Press, 1991
Buku Teks
Butarbutar, Tigor
Jurnal Analisis Kebijakan Kehutanan, 2008
Artikel Jurnal
edited by S. Dutta Gupta, Yasuomi Ibaraki
Springer, 2006
Buku Teks
Artikel Jurnal
edited by J. Reinert and Y.P.S. Bajaj
Narosa Publishing , 1989
Buku Teks