1. Theory and Practice of Crown and Bridge Prosthodontics;Tylman,1960
2. Tissue Reactions Around Artificial Crowns;Waerhaug;J. Periodontol.,1953
3. Reaction of Gingival Tissue to Self-Curing Acrylic Restorations;Waerhaug;J. Am. Dent. Assoc.,1957
4. Clinical Periodontology;Glickman,1965
5. Dental Materials;Skinner,1967