editor, John L. Allen
Dushkin/McGraw-Hill, 2000
Buku Referensi
Wiley Eastern, 1980
Buku Teks
Walker, Brian, author
Island Press, 2012
eBooks
Mayor, Frederico
UNESCO Publishing , 1999
Buku Teks
Dasmann, Raymond F. (Raymond Fredric), author
John Wiley & Sons, 1975
Buku Teks