by Rob Ranyard [and others]; edited by Rob Ranyard, W. Ray Crozier and Ola Svenson
Routledge , 1997
Buku Teks
Byrd, Jack, author
McGraw-Hill, 1982
Buku Teks
Eden, Colin, author
Macmillan, 1975
Buku Teks
Bunn, Derek W., author
McGraw-Hill, 1984
Buku Teks
edited by Anthony G. McGrew
Manchester University Press, 1985
Buku Teks