Books on Amazon
Rule / in head / brain / Field: there may be rules "written in your head" - problem: if a rule is "written in your head", then there must be a part of the brain reading it, and that will in turn be controlled byrules - even these rules can be changed.
fundamental rule / problem: a person for whom the rule is fundamental can not detect observations that undermine this rule.
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