1. My friend, Edward Hartley Angle;Wuerpel;Dent Cosmos,1931
2. Krogman WS, Sassouni V. A syllabus in roentgenographic cephalometry. Philadelphia: Philadelphia Growth Study; 1957
3. An esthetic evaluation of lip-teeth relationships present in the smile;Hulsey;Am J Orthod,1970
4. An evaluation of smiles before and after orthodontic treatment;Mackley;Angle Orthod,1993
5. The gingival smile line;Peck;Angle Orthod,1992