21. Esperanto for the English. Franks, A. [Browse] London, Milner & Co., Ltd., 1908. Book ReCAP - Remote Storage » KD 23895ReCAP - Remote Storage » KD 21848
22. The American Esperanto book; a compendium of the international language Esperanto, comp. and ed. by Arthur Baker. Baker, Arthur [Browse] Chicago, C.H. Kerr & company, 1907. Book ReCAP - Remote Storage » 1231.31.17
23. The grammar of Esperanto : a corpus-based description / Christopher Gledhill. Gledhill, Christopher J. [Browse] München : Lincom Europa, 1998. Book ReCAP - Remote Storage » PM8211 .G54 1998
24. Esperanto, the world interlanguage, comp. by George Alan Connor [and others] Connor, George Alan [Browse] New York, Beechurst Press [1948] Book ReCAP - Remote Storage » 1231.31.60
25. La ondo de Esperanto. Moscow : Ondo de Esperanto, 1909-1917. Journal ReCAP - Remote Storage » RAXA (La ondo de Esperanto.) Jaro 5-9, no. 1-99 (Jan. 1913-Mar. 1917)
26. The esperanto home-student. Specially arranged for self-instruction and for use in day and evening schools. Robbie, James [Browse] Leith, [At the offices of the] "Leith Burghs Pilot", [1909?] Book ReCAP - Remote Storage » 1231.32.20
27. Waarheid over Esperanto en Ido : La vérité sur l'Esperanto et l'Ido / Antoon Jozef Witteryck. Witteryck, Antoon Jozef [Browse] [Place of publication not identified] : Project Gutenberg, 2012. Book OnlineProject Gutenberg Online Catalog
28. Historio de la lingvo esperanto / Edmond Privat. Privat, Edmond, 1889-1962 [Browse] Hago, Nederlando : Intemacia Esperanto-Instituto, 1982. Book Loading...ReCAP - Remote Storage » PM8209 .P7 1982
29. Esperanto, its aims and claims : a discussion of the language problem and its solution / by Bernard Long, B.A. (Camb.). Long, Bernard Eustace [Browse] London : Esperanto Pub. Co., 1930. Book Loading...ReCAP - Remote Storage » PM8208 .L66 1930
30. Het Esperanto in Twintig Lessen Blok, A. [Browse] Project Gutenberg Book OnlineProject Gutenberg Online Catalog