1.
|
London, [England] : Longman, 1970. ©2007
|
2.
|
London, [England] : Longmans, 1969. ©2007
|
3.
|
London, [England] : Longman Group Limited, 1973. ©2007
|
4.
|
London, [England] : Longman, 1971. ©2007
|
5.
|
©2007 London, [England] : Longman, 1972.
|
6.
|
London, England : Longmans, Green & Co Ltd, 1967. ©2007
|
7.
|
London, [England] : Longman, Green and Co., 1968. ©2007
|