editors, Cristina Eghenter, Bernard Sellato, G. Simon Devung
Center for International Forestry Research, 2003
Buku Teks
Tim R. New, editor
[, Springer], 2012
eBooks
Nehrt, Lee Charles, author
Bureau of Business Research, Indiana University, 1970
Buku Teks
Jansson, Bruce S., author
Thompson, 2005
Buku Teks
Reynolds, Paul Davidson, author
Prentice-Hall, 1982
Buku Teks SO