Green et al 2002 is a book according to the bibliography: Partisan Hearts and Minds: Political Parties and the Social Identities of Voters. No surprise it's not on the open web.

You can find it on Libgen: http://lib.freescienceengineering.org/view.php?id=557285 (If you did check Libgen and failed, I'd guess it's because you searched the full title, which fails, rather than just 'partisan hearts and minds', which succeeds; I've noticed the Libgen search engines seem to have problems with long titles and/or colons.)