Varma, Baidya Nath, author
Routledge , 1980
Buku Teks
Baron, Robert A., author
Allyn and Bacon, 2000
Buku Teks
Solberg, Carle
Stanford University Press, 1979
Buku Teks
Fredrickson, George M., author
Univ. of California Press, 2000
Buku Teks
Christie, Clive J., author
Tauris Academic, 1996
Buku Teks