Books on Amazon
Intentionality/Language/Field: Language comes into play only when "believes that" is attributed. Thesis: serious behavioral attribution works without language.
Intentionality/FieldVsStalnaker: we need more than the atomistic approach that everything that suffices a Boolean algebra is sufficient for the explanation of mind states (by sets of possible worlds). - Instead: we need a systematic approach of content. - Therefore, we need a more fine-grained structure than that of sets of possible worlds.
Realism, Mathematics and Modality Oxford New York 1989
Truth and the Absence of Fact Oxford New York 2001
Science without numbers Princeton New Jersey 1980