publisher: Open University Press publish date: September 28th 1994
format: paperback pages: 244
language: English
ISBN:
0335193153 (9780335193158)
publisher: Open University Press
format: paperback
language: English
ISBN:
0335159796 (9780335159796)
publisher: Open University Press publish date: January 1st 1987
format: hardcover pages: 235
language: English
ISBN:
033515980X (9780335159802)