Delineation of the English and German characters and languages, with respect to their reciprocal influence upon each other / O. Wetzel. In: Jahresbericht. Jg.1870, S. 1 21
 

JahresberichtJahresbericht ... womit zu der öffentlichen Prüfung am 11. und 12. April 1870 ...Delineation of the English and German characters and languages, with respect to their reciprocal influence upon each other