1. Some fundamentals in tooth form;Wheeler;Dent Cosmos,1928
2. Restoration of gingival or cervical margins in full crowns;Wheeler;Dent Cosmos,1931
3. Wheeler RC. Dental anatomy, physiology and occlusion. eds 1-4. Philadelphia: Saunders; 1940, 1950, 1958, 1965.
4. Dental anatomy and occlusion;Kraus,1967
5. Glickman I. Clinical periodontology. eds 1-4. Philadelphia: W. B. Saunders; 1953, 1958, 1964, 1966.