Books on Amazon
Psychology/belief/Schiffer: a scientific cognitive psychological theory will quantify via functions from external indices of functional roles on internal physical states. - The external indices must be no propositions, but can be interpreted sentences or formulas - even uninterpreted - The psychology must accept any content - That is, they must not be semantical - Instead, the laws, such as input to belief leads to action - unformulated theory: we identify the equivalence class of sets that they would formulate.
Instead of content: authority of a believing person is sometimes a good example.
Remnants of Meaning Cambridge 1987