1
Published 2007
2
Published 1993
3
Published 1961
4
5
by Solomom, J. S.
Published 2003
6
by Khavronina, S. A.
Published 1963
7
8
by Syed Ali
Published 2002
9
by Smart, J. R.
Published 1986
10
11
by Brooks, Elaine
Published 1997
12
by Baker, Joanna
Published 2003
13
by Sokolik, M. E.
Published 1993
14
by Celce-Murcia, Marianne
Published 1988
15
by Watcyn-Jones, Peter
Published 1995
16
Published 2005
17
by Allen, Virginia French.
Published 1983
18
19
by Madsen, Harold S, 1926-
Published 1983
20
Published 1990