Kasulik kirjandus:
Henry Petrosky "THE PENCIL. A History of Design and Circumstance" 1989
Henry Petrosky "THE PENCIL. A History of Design and Circumstance" 2000
David Rees " How to sharpen pencils" 2012
Pliiatsikunst:
https://www.google.ee/search?q=art+made+with+pencils&sa=X&espv=210&es_sm=122&tbm=isch&tbo=u&source=univ&ei=-VxBU5q6EorY7AbS2YHwDQ&ved=0CCkQsAQ&biw=1360&bih=667
http://www.andrasborocz.com/sculpt_pages/pencilbirds.html
http://www.artbma.org/educators/atg/pdf/ATG_09-09.pdf
Lingid:
http://www.pencils.com/
http://www.pencilrevolution.com/
http://thegadgetflow.com/portfolio/colorstripe-colored-pencils-55/
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