Dasmann, Raymond F. (Raymond Fredric), author
John Wiley & Sons, 1974
Buku Teks
Schiller, Bradley R.
Prentice-Hall, 1984
Buku Teks
Brooks, Ann, author
Jalasutra, 1997
Buku Teks
Edgell, Stephen, author
Routledge, 1993
Buku Teks
Goode, William J.
Prentice-Hall, 1964
Buku Teks