1. Altemus, L. A.: A comparison of cephalofacial relationships. Angle Orthodont.30 (1959), 223–239.
2. Altemus, L. A.: Comparative relationships. Angle Orthodont.33 (1963), 217–221.
3. Angle, E. H.: Treatment of malocclusion of the teeth and fractures of the maxillae. 6th Ed.S.S.W.Den.Mfg.Co 1900.
4. Barnett, J. W.: Integumental profile and its supporting dentoskeletal framework: Cephalometric studies on boys aged 13 to 16 years. Amer. J. Orthodont.48 (1962), 389–390.
5. Björk, A.: The face in profile. Svensk. Tand. Tidskrift.40, 5B (1947).