Campbell, John C.
Frederick A. Preger, 1960
Buku Teks
Hadar, Leon T.
Leon Hadar, 2005
Buku Teks
Alexander R. Dawoody, editor
Springer, 2015
Buku Teks
edited by Shireen Hunter ; foreword by Robert G. Neumann and G. Henry M. Schuler
Westview Press, 1985
Buku Teks
Dabbah, Maher M.
Cambridge University Press, 2007
Buku Teks