1. Simplicity and the acceptability of scientific theories;Ackermann,1961
2. The Fabric of Geology;Anderson,1963
3. Boehner, Ph.Ockham Philosophical Writings. Edinburgh: Thomas Nelson.
4. The Way Things Are;Bridgman,1959
5. Causality, the Place of the Causal Principle in Modern Science;Bunge,1959