Rose, Richard, 1933-, author
Routledge, 2005
Buku Teks
Balassa, Bela A., author
Harvester Wheatsheaf, 1989
Buku Teks
Marchbank, Jennifer, author
Routledge, 2000
Buku Teks
edited by Leo Goedegebuure ... [and others]
Pergamon Press, 1994
Buku Teks
Wang, James C.F., author
Prentice-Hall, 1994
Buku Teks