His Formation and inhibition of dental calculus, 1969.

NLM files, 3/17/86 (hdg.: Schroeder, Hubert E.)

His The periodontium, c1986: CIP t.p. (Hubert E. Schroeder) CIP data sheet (b. b. 2/17/31)

LC data base, 3/25/86 (hdg.: Schroeder, Hubert Ernst; usage: Hubert E. Schroeder)

Information from 678 field, converted Feb. 17, 2015 (Dr., University of Zürich, Dental Institute, Dept. of Operative Dentistry and Periodontology)