Artis, M.J.
Department of Economics, University of Manchester, [date of publication not identified]
Buku Teks
Walker, Gilbert
Heimann , 1957
Buku Teks
Cross, Rod
Martin Robertson , 1982
Buku Teks
Tomlinson, Jim, author
Methuen, 1981
Buku Teks
edited by Tony Buxton, Paul Chapman and Paul Temple
Routledge , 1994
Buku Teks