Dasmann, Raymond F. (Raymond Fredric), author
John Wiley & Sons, 1974
Buku Teks
Jarvis, Peter J., author
Prentice-Hall, 2000
Buku Teks
Bulajic, Milan, author
Martinus Nijhoff, 1993
Buku Teks
Artikel Jurnal
Adler, Frederick R., author
Cambridge University Press, 2013
Buku Teks