Bennie, Lynn G. , John Curtice and Wolfgang Rudig (1996) `Party Members', in D. McIver (ed.) Liberal Democrats. Hemel Hempstead: Harvester Wheatsheaf.
2.
Rudig, Wolfgang , Mark N. Franklin and Lynn G. Bennie (1996) `Up and Down with the Greens: Ecology and Politics in Britain, 1989-1992', Electoral Studies15: 1-20.
3.
Seyd, Patrick and Paul Whiteley (1991) Labour's Grass Roots. Oxford: Clarendon Press.
4.
Whiteley, Paul , Patrick Seyd and Jeremy Richardson (1994) True Blues: The Politics of Conservative Party Membership. Oxford: Clarendon Press.
5.
Widfeldt, Anders (1995) `Party Membership and Party Representativeness', in H.-D. Klingemann and D. Fuchs (eds) Citizens and the State. Oxford: Oxford University Press.
