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1
المؤلفون: Sydney W. Bradley, A.J. Kimm, H.L. Keith, Harry F. Hamilton, A.P. Burkhart, William Kettler, Abram Hoffman, H.C. McKittrick, C.G. Gillam, C.A. Herrick, Franklin S. Fluck, G. Walter Dittmar, J.P. Luthringer, W.L. Fickes, Ernest W. Elmen, Claude S. Larned, H.C. Pollock, W.F. Beavers, Robert E. Elster, C.B. Miller, George F. Burke, George B. Smith, Oliver J. O’neal, H.H. Antles, Henry Gilman
المصدر: The Journal of the National Dental Association. 7:315-320
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2
المؤلفون: Bert Boyd, F.J. Shaddock, J. Herbert Hood, L.R. Walston, Dwight R. Wilson, F.F. Drew, Frank J. Bell, R.P. Taylor, J.H. Baldwin, H.C. McKittrick, Albert L. Midgley, W.E. Williams, M.R. Chapin, E.S. Smith, H.H. Antles, M.J. Goode, William Kettler, C.A. Herrick
المصدر: The Journal of the National Dental Association. 8:335-340