Longman, 1995
Buku Teks
Vincent, Michael
Philadelphia John Benjamin Publishing, 1992
Buku Teks
edited by Arthur Waldhorn, Olga S. Weber, Arthur Zeiger
R.R. Bowker, 1990
Buku Teks
Whitworth, Michael H., author
Wiley-Blackwell, 2010
Buku Teks
Martin Montgomery ... [and others]
Routledge , 2007
Buku Teks