^McCall, J. P. (May 31, 1968). "Paul Roscoe Stillman 1871-1945. Clinical Researcher in Periodontics—Author". The New York Journal of Dentistry. 38 (6): 201.
PMID4871369.
^Lindhe, Jan, ed. (2008). "Trauma from Occlusion: Periodontal Tissues". Clinical Periodontology and Implant Dentistry (5th ed.). Oxford: Blackwell Munksgaard. p. 349.
ISBN978-1-4051-6099-5.
^McCall, J. P. (May 31, 1968). "Paul Roscoe Stillman 1871-1945. Clinical Researcher in Periodontics—Author". The New York Journal of Dentistry. 38 (6): 201.
PMID4871369.
^Lindhe, Jan, ed. (2008). "Trauma from Occlusion: Periodontal Tissues". Clinical Periodontology and Implant Dentistry (5th ed.). Oxford: Blackwell Munksgaard. p. 349.
ISBN978-1-4051-6099-5.