1. Intraoral leukoplakia, abrasion, periodontal breakdown, and tooth loss in a snuff dipper;Christen;JADA,1979
2. Snuff dipping and tobacco chewing in a group of Texas college athletes;Christen;Texas Dent J,1979
3. Smokeless tobacco: the folklore and social history of snuffing, sneezing, dipping, and chewing;Christen;JADA,1982
4. Oral pathology;Shafer,1969
5. Thoma’s oral pathology;Gorlin,1978