Esperanto and its rivals : the struggle for an international language /
Roberto Garvía
. – Philadelphia : University of Pennsylvania Press, cop. 2015
. – VIII, 226 p. ; 24 cm
. – (Haney foundation series) .
Bibliografio: p. 169-217. Índekso
978-0-8122-4710-7
Volapuko– Historio Ido– Historio Esperanto– Historio– Historio