Sources
- Richard Hickman, Art, and design, 2002, Pearson Publishing 2000.
- Cott Foresman, Rebecca brooks, Ph.D., Art, California edition, 2005.
- David A. Lauer, Stephen Pentak, Design basics, 7th edition, 2007.
- Rosalind Ragan Art talk, 2d edition, volume2, 1995
- Thomas E French, Charles J. Vierck, Robert J. Foster, Engineering Drawing and Graphic Technology, 7th edition, p.22 Sn, the complete book of drawing.
- ObonyoO, Elisabeth C. Orchardson-Mazrui, Art and design for form1 and2, printpak ltd, 2008.
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