Cahyadi, Eko Ruddy, Department of Management, Faculty of Economics and Management, IPB University, Jl. Raya Dramaga, Dramaga Campus of IPB, Bogor, 16680, Indonesia (Indonesia)
Cahyono, S Andy, Balai Penelitian Teknologi Kehutanan Pengelolaan DAS, Jl. A. Yani, PO Box 295, Pabelan, Kartasura, PO Box 295 Surakarta Telepon/Fax.: (0271) 716709/716959 Email: bpk_solo_pp@yahoo.com (Indonesia)
Christian, Yoppie, Burung Indonesia, Jl. Dadali No. 32 Bogor, Indonesia (Indonesia)

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