Hollands, Robert G.
Macmillan, 1990
Buku Teks
Murray Saunders, Paul Trowler and Veronica Bamber, editor
McGraw-Hill, 2011
Buku Teks
Barnes, Melvyn, author
Clive Bingley , 1976
Buku Teks
Casteleyn, Mary, author
Bowker Saur , 1993
Buku Teks
edited by Margaret Oldroyd
Library Association , 1997
Buku Teks