Hettne, Bjorn 1939-
Longman Scientific & Technical , 1995
Buku Teks
Horowitz, Irving Louis, author
Oxford University Press, 1972
Buku Teks
Meier, Gerald M., author
Harper & Row, 1968
Buku Teks
Beard, Jennifer, author
Routledge, 2007
Buku Teks
edited Charles R. Blitzer, Peter B. Clark and Lance Taylor
Oxford University Press, 1977
Buku Teks