The following books deal more fully with topics discussed above:

Mathematics

• Polya, G. How to Solve It. 1945.
• Whitehead, A. N. Introduction to Mathematics. 1919.
• Courant, R. and Robbins, H. What is Mathematics. 1941.

Statistical Method

• Tippett, L. H. C. Statistics. 1943.
• Lundberg, G. H. Social Research. 1942.

History of Mathematics

• Bell, E. T. Men of Mathematics. 1937.