1. Athanisios E, .Athanasiou AE. Orthodontic Cephalometry. London: Mosby-Wolfe.
2. Freeman RS, Adjusting A-N-B angle to reflect the effect of maxillary position.Angle Orthod 1981;51(2):162-71
3. Broadbent BH, A new X-ray technique and its application to orthodontia.Angle Orthod 1931;1(2):45-66
4. Graber TM, Vanarsdall R, .Orthodontics: current principles and techniques.928
5. Proffit WR, Field HW, Ackerman JL, Bailey LT, Tulloch JFC, .Contemporary orthodontics.744