The Language of Mathematics: The Stories behind the Symbols
A Beginner's Guide to Mathematical Logic (Dover Books on Mathematics)
Introduction to Logic: and to the Methodology of Deductive Sciences (Dover Books on Mathematics)
On Formally Undecidable Propositions of Principia Mathematica and Related Systems (Dover Books on Mathematics)
The Canterbury Puzzles (Puzzle Books)
Detective Logic Puzzles for Adults: 100 Crime-Themed Logic Grid Puzzles - Fun, Easy to Hard Logic Puzzles - Large Brain Teaser Book
Lectures on the Philosophy of Mathematics
Logic Workbook for Gritty Kids: Spatial reasoning, math puzzles, word games, logic problems, activities, two-player games. (The Gritty Little Lamb ... & STEM skills in kids ages 6, 7, 8, 9, 10.)