Cambridge University Press, 1990
Buku Teks
Braillard, Philippe
Frances Pinter , 1990
Buku Teks
Williams, Marc
Harvester Wheatsheaf , 1994
Buku Teks
Cohen, Daniel
MIT Press, 1988
Buku Teks
Nurkse, Ragnar, 1907-1959, author
Harvard University Press, 1962
Buku Teks