Numbers: Rational and Irrational - Ivan Niven - New Mathematical Library - 1

Linear Algebra by Hoffman & Kunze

Continued Fractions by C. D. Olds - The MAA New Mathematical Library

Invitation to Number Theory by Oystein Ore - The MAA New Mathematical Library

Groups and Their Graphs by Grossman & Magnus - The MAA New Mathematical Library

Numbers: Rational and Irrational by Ivan Niven

First Concepts of Topology by Chinn & Steenrod, The MAA New Mathematical Library

Numbers: Rational and Irrational, Ivan Niven, Good Book