1. The case against smokeless tobacco: Five facts for the health profession to consider;Christen;J. Amer. Dental Assoc.,1980
2. Snuff dipping and tobacco chewing in a group of Texas college athletes;Christen;Texas Dental J.,1979
3. The effects of exposure to chewing tobacco on the oral mucosa of monkey and man;Cohen;Ann. Roy. Coll. Surg. Engl.,1971
4. Videodisc/Microcomputer Courseware Design;DeBloois,1982