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Ganong W. F. ( 2005) Review of Medical Physiology 22nd  
          edition.       Boston : McGraw Hill
[2]
Thibodeau,P (1996) Anatomy and Physiology 3rd edition.     
            St.Louis : Mosby
[3]
http://highered.mcgraw-hill.com/sites/0072437316/student_view0
/chapter47/animations.html#
[4]
http://www.drrind.com/thyroidscale.asp
[5]
http://arbl.cvmbs.colostate.edu/hbooks/pathphys/endocrine/
[6]
adrenal/medhormones.html
[7]
http://www.endocrineweb.com/parathyroid.html
[8]
http://biologyinmotion.com/thyroid/