CRC Concise Encyclopedia of Mathematics: Print Location: Ref QA5 .W45 2003. This encyclopedia provides definitions, formulas and derivations, figures, tables, and resources for further research. A version is available online.
CRC Standard Mathematical Tables and Formulae (31st Edition): Print Location: Ref QA47 .M315 2003. This book covers topics like analysis of numbers, algebra, discrete math, geometry, continuous mathematics, special functions, probability and statistics, scientific computing, and financial analysis.
Facts on File Calculus Handbook: Print Location: Ref QA303.2 M36 2003. This book is intended for use by middle school, high school and college students taking single-variable calculus.
Facts on File Geometry Handbook: Print Location: Ref QA445.2 G67 2003. This book provides a basic introduction to geometry.
Mathworld: This website, best described as a mathematics encyclopedia, provides information on a variety of subjects: algebra, applied math, calculus, discrete math, the foundations of math, geometry, math history and terminology, number theory, probability and statistics, recreational math, and topology.
Oxford Reference Online: This resource provides quality, up-to-date information from a series of well-respected books, including books on mathematics.