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Any book by Titu Andreescu
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Books by Ian Stewart
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Fun and Fundamentals of Mathematics
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How To Solve It
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Mathematics can be fun
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Origami Design Secrets
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What is Mathematics
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A foundation course in Mathematics
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Advanced Engineering Mathematics
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Algebra in Ancient and Modern Times
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Analysis 1&2
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Calculus 1 & 2
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Calculus and Analytic Geometry
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Complex Analysis
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Contemporary Abstract Algebra
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Differential Equations
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Discrete Mathematics
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Elementary Number Theory
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Graph Theory
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Higher Algebra
Bernard & Child
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Linear Algebra
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The Art of Computer Programming
D Knuth
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