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Idiolect/Type/Token/Field: when you look at an idiolect, you can also start with sentence types - otherwise they have to be tokens because of the demonstrative pronouns, etc. - sentence types: are no longer ambiguous, if they are individuated compositionally instead phonetically or orthographically. Ambiguity: E.g. "Visiting relatives can be boring" - one should count them as different tokens of two different sentences.
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