Helmholtz-Realgymnasium in Berlin-Schöneberg :  Jahresbericht 1925 

 - o.a. 
<br/><br/><label>Subjects--Personal Names: </label><br/>Tessendorff, Ferdinand <Oberstudiendirektor><br/>Thouret, Georg
<br/><br/><label>Subjects--Corporate Names: </label><br/>Helmholtz-Realgymnasium