1. Orthodontics, principles and practice;Graber,1967
2. A philosophy of orthodontic treatment;Tweed;Am J Orthod Oral Surg,1945
3. Edgewise sequential directional force technology;Merrifield;J CH Tweed Found,1986
4. Analysis concepts and values, part I;Gebeck;J Charles Tweed Found,1989
5. Analysis concepts and values, part II;Merrifield;J Charles Tweed Found,1989