Gift of the Cotton maiden textiles of Flores and the Solor island
edited by Roy W. Hamilton
University of California, 1994
 Buku Teks
Medieval age / edited by Angel Flores
Dell Publishing Co., 1963
 Buku Teks
Pearce, David William, 1941-
Economics of natural resources and the environment
Harvester Wheatsheaf, 1990
 Buku Teks
Camp, William G.
Managing our natural resources
Delmar, 1997
 Buku Teks
Avery, Thomas Eugene
Natural resources measurements
McGraw-Hill, 1975
 Buku Teks