1. A. Church, ‘A Formulation of the Simple Theory of Types', The Journal of Symbolic Logic, vol. 5 (1940), pp. 56–68.
2. A. Felty, ‘Encoding Dependent Types in an Intuitionistic Logic', in Logical Frameworks, edited by G. Huet and G. Plotkin (Cambridge University Press, 1991), pp. 215–251.
3. M. Gordon, ‘HOL: A Machine Oriented Formulation of Higher Order Logic', Technical Report 68, Computer Laboratory, University of Cambridge, revised version (July 1985).
4. M. J. C. Gordon, ‘HOL: A Proof Generating System for Higher-Order Logic', in VLSI Specification, Verification and Synthesis, edited by G. Birtwistle and P. A. Subrahmanyam, Kluwer International Series in Engineering and Computer Science (Kluwer, 1988), pp. 73–128.
5. M. J. C. Gordon and T. F. Melham (eds.), Introduction to HOL: A theorem proving environment for higher order logic, forthcoming book (Cambridge University Press, 1993).