 This version of psychologism regards the social to be exhaustively determined by externalist mental states. Mid-century opponents of standard psychologism (Mandelbaum 1955, Gellner 1956, Goldstein 1958) had raised the problem of attitudes toward social entities, but it is not clear in those views whether the external world was causally or constitutively related to the mental states. Following Kripke 1972 and Putnam 1975, the explicitly externalist view was developed by Bhargava 1992 and Pettit 1993. Pettit argues for externalist psychologism as a qualified version of individualism. Like more standard psychologism, he takes social phenomena to be exhaustively determined by mental states. The mental states in question, however, are partly constituted by external stuff.