1. “A Computational Logic Handbook”;Boyer,1988
2. Camilleri, Albert J., “Executing Behavioural Definitions in Higher Order Logic”, PhD Thesis, University of Cambridge 1988.
3. “Semantics of Evidence”;Constable,1986
4. “Implementing Mathematics with the Nuprl Proof Development System”;Constable,1986
5. Gordon, M. J. C., “The HOL Description”, Dec. 1990.