Tritten, C.B.; Armitage, Gary C. (1996). "Comparison of a sonic and a manual toothbrush for efficacy in supragingival plaque removal and reduction of gingivitis". Journal of Clinical Periodontology. 23 (7): 641–648. doi:10.1111/j.1600-051X.1996.tb00588.x. PMID8841896.
Tritten, C.B.; Armitage, Gary C. (1996). "Comparison of a sonic and a manual toothbrush for efficacy in supragingival plaque removal and reduction of gingivitis". Journal of Clinical Periodontology. 23 (7): 641–648. doi:10.1111/j.1600-051X.1996.tb00588.x. PMID8841896.