http://micro.magnet.fsu.edu/cells/animalcell.html

http://www.cartage.org.lb/en/themes/Sciences/Zoology/AnimalPhysiology/Anatomy/AnimalCellStructure/AnimalCellStructure.htm

http://en.wikipedia.org/wiki/Animal_cell

http://www.harweb.com/cell/animal.htm

http://web.jjay.cuny.edu/~acarpi/NSC/13-cells.htm

http://micro.magnet.fsu.edu/cells/animals/animalmodel.html

http://www.funtrivia.com/playquiz/quiz14606510ba900.html

http://library.thinkquest.org/28751/review/cells/2.html

http://biology.about.com/library/weekly/aa031600b.htm

http://www.invitrogen.com/site/us/en/home/Products-and-Services/Applications/Cell-and-Tissue-Analysis/Cell-Structure.html