1. Alexander, H. G. (ed.), The Leibniz-Clarke Correspondence, Philosophical Library, New York, 1956.
2. Carnap, R., Philosophical Foundations of Physics, Basic Books, New York, 1966.
3. Earman, J., ‘Space-Time’, Journal of Philosophy
37 (1970), 259–78.
4. Fine, A., ‘Physical Geometry and Physical Laws’, Philosophy of Science
31 (1964), 156–62.
5. Grünbaum, A., ‘Geometry, Chronometry and Empiricism’, in, Minnesota Studies in the Philosophy of Science III, University of Minnesota Press, Minneapolis, 1962.