1. “Toys and Tales with Everyday materials”, Sudharshan Khanna, Gita Wolf, Anushka Ravishankar, National Institute of Design, Ahmedabad

2. “Aptitude, Personality & Motivation Tests, 2nd Edition”, Jim Barrett

3. “Simple Science Experiments”, Hans Jurgen Press, 1967 Discovery Toys

4. “Mind Maps at work”, Tony Buzan  

5.There are lots of very interesting but unknown Russian books which would be available in old libraries, second hand book shops. One would have to dig into the books shelves with patience and flip around pages to catch hold of such books. Few such books that we referred

a. “Physics can be fun”, Y. Perelman
b. “Miracles on Wheels”, Anatoly Markusha : 

 Useful links:

I. Fantastic collection of e-books and toys by a passionate Professor based out of Pune. http://arvindguptatoys.com

II. The Nobel prize in Physics. Information about the Laureates, articles by / related to them and educational games and simulations http://nobelprize.org/physics

III. A source giving a great range of simple devices cheaply using local low-cost resources. http://museumtechnologymozambique.blogspot.com/

IV. From shark attacks to Fusion Reactions it has got it all about "How Things Work". Easily one of the finest collections. http://science.howstuffworks.com/

V. What Google did to Search, is what Wikipedia doing to field of Encyclopedia.
http://en.wikipedia.org/wiki/  

Toys 

I. Eklavya Education Foundation's Taleem Division develops and creates novel and original educational games which stimulate, motivate, and encourage basic educational and intellectual skills. http://www.eklavya.org/productforsale.htm  

II. The Kaleidoscope Classic: A modified chessboard challenge with different shapes to be arranged. Expands the mind and good toy to develop perseverence http://www.thekaleidoscopeclassic.com

III. ASSETplus is a collection of activities, worksheets, manipulative and games specially designed to strengthen and reinforce skills. http://www.ei-india.com/Assetplus.php

IV. Science Learning Kits from Edu Science, USA www.toysrus.com