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5- http://ezinearticles.com/?Ergonomics-for-Graphic-and-Web-Designers&id=368873
6- http://www.articlerich.com/Article/How-to-Pick-and-Choose-Fancy-Toys-or-Educational-Toys-for-Children/17٠8٠43
7- http://sixrevisions.com/usabilityaccessibility/10-simple-web-accessibility-tips-you-can-do-today
8- http://www.britannica.com/EBchecked/topic/111282/childrens-game
9- http://www.britannica.com/search?query=toy
10- http://www.earlychildhoodnews.com/earlychildhood/article_print.aspx?ArticleId=678
11- http://www.everydayergonomics.org/childergonomics/childergonomics.php
12- http://www.fun-educational-toys.com/#safety
13- http://www.humanfactors.com/downloads/10tips.asp
14- http://www.merriam-webster.com/dictionary/toy
15- http://www.revibrevet.com/questions/the-way-to-select-and-select-fancy-toys-or-educational-toys-for-kids/
16- http://www.sosign.com/Web-ergonomics.html
17- http://www.tietoy.org