1. "The Logic of Modern Physics" by P.W. Bridgman, pp. 1-32
The electronic copy of the 1958 edition can be found there.
2. "Logical Nonsense" by Lewis Carrol, pp. 505-546
3. "What Is Mathematics?" by R.Courant and H.Robbins, p. 22
4. "Fate and Freedom" by J.Frank, pp. 458-469
5. "The Elements of Mathematical Logic" by P.Rosenbloom, pp. 28-68
6. "An Introduction to Mathematical Thought" by E.R.Stabler, pp. 1-119
7. "Introduction to Logic" by Alfred Tarski, pp.3-140
The book is digitised and can be accessed there.
8. "Philosophy of Mathematics and Natural Science" by H.Weyl, pp. 3-29
The following articles in the American Mathematical Monthly can be referenced also:
- "Geometry and Empirical Science" by C.G.Hempel
- "On the Nature of Mathematical Truth" by C.G.Hempel
- "Symbolic Logic" by Saunders MacLane
- "The Nature of Mathematical Proof" by R.L.Wilder