11. Esperanto on wings / by Wilhelm Wingen ; translated from the German by Helene Wolff. Wingen, Wilhelm [Browse] [place of publication not identified] : Helene Wolff, 1950. Book Loading...ReCAP - Remote Storage » X54655688 Bookmark
12. English-Esperanto Dictionary Hayes, C. F. (Charles Frederic) 1857-1942 [Browse] Project Gutenberg Book Online Project Gutenberg Online Catalog Bookmark
13. Esperanto-English dictionary, by A. Motteau. Motteau, Achille, 1836-1906 [Browse] London, 'Review of Reviews' Office, [1904?] Book ReCAP - Remote Storage » KC 5359 Bookmark
14. Fundamento de Esperanto, gramatiko, ekzercaro, universala vortaro. Zamenhof, L. L. (Ludwik Lazar), 1859-1917 [Browse] Paris, Hachette et cie; [etc., etc.] 1905. Book ReCAP - Remote Storage » KC 1624 Bookmark
15. Dictionnaire esperanto-français, par L. de Beaufront. 11. mille. Beaufront, L. de (Louis), 1855- [Browse] Paris, Hachette et cie, 1904. Book ReCAP - Remote Storage » 1231.31.3 Bookmark
16. Esperanto-russkiĭ slovar ̓: okolo 26 000 slov : s pril. kratkogo grammaticheskogo ocherka esperanto / Sost. [i avt. predisl.] d-r fidol. nauk E. A. Bokarev ; [predisl. V. Grigoréva] Bokarev, E. A. [Browse] Moskva : Sov. entsiklopediia︠,︡ 1974. Book ReCAP - Remote Storage » 3283.243.5 Bookmark
17. Short outline of Esperanto / by J.J. Sussmuth. Sussmuth, J. J. [Browse] Rockford, Ill., U.S.A. : Published by American Esperanto Institute, 1936. Book Loading...ReCAP - Remote Storage » PM8208 .S97 1936 Bookmark
19. En Rusujo per Esperanto / A. Rivier. Rivier, A. [Browse] [Place of publication not identified] : Project Gutenberg, 2013. Book Online Project Gutenberg Online Catalog Bookmark
20. Esperanto and its rivals [electronic resource] : the struggle for an international language / Roberto Garvia. Garvía, Roberto [Browse] Philadelphia : University of Pennsylvania Press, [2015]. Book Online JSTOR DDA Bookmark