Chu - Human Insight Problem Solving - New paperback or softback - X555z

Fox - Effective Group Problem Solving - New paperback or softback - X555z

Maddy - Realism in Mathematics - New paperback or softback - X555z

Cooke - Computer Mathematics - New paperback or softback - X555z

Howson - Popularization of Mathematics - New paperback or softback - X555z

Evyatar - Motivated Mathematics - New paperback or softback - X555z

Jairam - Mathematics Calculus - New paperback or softback - X555z

Mathematics as Problem Solving by Soifer