Anderson, Dennis
Global Environment Facility , 1993
Buku Teks
Jones, Gareth R., author
McGraw-Hill, 2007
Buku Teks
Chanpman & Hall, 1996
Buku Teks
Whitehouse, Gary E.
Chart, Diagrs , 1976
Buku Teks
Addison-Wesley Publishing Company, Inc., 1991
Buku Teks