Đọc thêm Quốc tế ngữ

Tim Morley (13 tháng 8 năm 2012). “Learn Esperanto first: Why Elementary Schools Should Teach Esperanto” (TEDxGranta TED Talk Video with Closed Captions) (bằng tiếng Anh).
Emily van Someren. Republication of the thesis 'The EU Language Regime, Lingual and Translational Problems'.
Ludovikologia dokumentaro I Tokyo: Ludovikito, 1991. Facsimile reprints of the Unua Libro in Russian, Polish, French, German, English and Swedish, with the earliest Esperanto dictionaries for those languages.
Fundamento de Esperanto. HTML reprint of 1905 Fundamento, from the Academy of Esperanto.
Esperanto Lessons. Including the alphabet, adjectives, nouns, plural, gender, numbers, phrases, grammar, vocabulary, verbs, exam, audio, and translation.
Ross Perlin, "Nostalgia for World Culture: A New History of Esperanto",review of "Bridge of Words" by Esther Schor
Auld, William. La Fenomeno Esperanto ("The Esperanto Phenomenon"). Rotterdam: Universala Esperanto-Asocio, 1988.
Butler, Montagu C. Step by Step in Esperanto. ELNA 1965/1991. ISBN 0-939785-01-3.
DeSoto, Clinton (1936). 200 Meters and Down. West Hartford, Connecticut, US: American Radio Relay League, p. 92.
Crystal, David, article "Esperanto" in The New Penguin Encyclopedia, Penguin Books, 2002.
Crystal, David, How Language Works (pages 424–5), Penguin Books, 2006. ISBN 978-0-14-101552-1.
Everson, Michael. “The Alphabets of Europe: Esperanto” (PDF). (25.4 KB). Evertype, 2001.
Forster, Peter G. The Esperanto Movement. The Hague: Mouton Publishers, 1982. ISBN 90-279-3399-5.
Garvia, Roberto. Esperanto and Its Rivals: The Struggle for an International Language. University of Pennsylvania Press, 2015. ISBN 0812291271.
Gledhill, Christopher. The Grammar of Esperanto: A Corpus-Based Description. Second edition. Lincom Europa, 2000. ISBN 3-89586-961-9.
Harlow, Don. The Esperanto Book. Self-published on the web (1995–96).
Okrent, Arika. In the Land of Invented Languages.
Wells, John. Lingvistikaj aspektoj de Esperanto ("Linguistic aspects of Esperanto"). Second edition. Rotterdam: Universala Esperanto-Asocio, 1989.
Zamenhof, Ludovic Lazarus, Dr. Esperanto's International Language: Introduction & Complete Grammar The original 1887 Unua Libro, English translation by Richard H. Geoghegan; HTML online version 2006. Print edition (2007) also available from ELNA or UEA.
Patterson, Robert; Huff, Stanley M. (tháng 11 năm 1999), “The Decline and Fall of Esperanto”, Journal of the American Medical Informatics Association, 6 (6): 444–446, doi:10.1136/jamia.1999.0060444, PMC 61387, PMID 10579602
Esperanto at the Encyclopædia Britannica

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