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<http://www.annewilliams.com/advanced/media/nr_backpack_usage.pdf>.

CascadeClimbers.com: The Future of Backpack Design.  4 Jan. 2007 

<http://www.cascadeclimbers.com/forum/ubbthreads.php/ubb/showflat/Number/622662/page/Post622662>.

Conray, John R., III.  "Spine."  World Book Encyclopaedia.  ed. 2004.

Foester, Von and Marilyn Miller.  Our Kids, Backpacks, and the Back Epidemic.  28 Jan. 2007

<http://www.created-for-u.com/bTp8_Detailed_Study.htm>.

Graham, Sarah.  Pounding Pavement Generates Electricity When Wearing Novel

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Lifting Images Parlay International.  Back Safety.  5 Jan. 2007

            <http://www.pp.okstate.edu/ehs/kopykit/backsafety.pdf>.

Minkel, JR.  A Parent’s Dream: Bungee-Powered Backpacks That Spare the Back.  4 Jan.

2007    <http://www.sciam.com/article.cfm?chanID=sa003&articleID=A08D8A1

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Your Spine.  27 Dec. 2006  <http://www.bu.edu/lernet/GK12/tulay/Your_spine.pdf>.