The Interactive Talking Math Book was based on mathematical formulas and definitions from many resources including the books:

Mathematics From The Birth Of Numbers
By John Gullberg
© Copyright 1997 By John Gullberg

Calculus One & Several Variables Third Edition
By S.L. Salas and Einar Hille
© Copyright 1978 by John Wiley & Sons Inc.

Elementary Functions For Precalculus Mathematics Third Edition
By Israel H. Rose and Esther Phillips
© Copyright 1978 by Scott, Foresman and Company

Webovations.com Gives Credits & Thanks
The A Talking Calculator was written in JavaScript code which was created for the web community by Netscape® Corporation
www.netscape.com

A Talking Calculator was developed with a Shockwave Flash user interface which provides multimedia features and functionality:
Macromedia® Inc.
www.macromedia.com

A Talking Calculator was based on code from a lesson for a basic functional JavaScript calculator which was outlined in the book:
Special Edition Using JavaScript Second Edition
By Andrew Wooldridge, Mike Morgan, Mark C. Reynolds, Jerry Honeycutt
© Copyright 1997 by Que® Corporation
www.quecorp.com