Smith, Arden R. (2006). «Esperanto». In: Drout, Michael D. C.J. R. R. Tolkien Encyclopedia: Scholarship and Critical Assessment. [S.l.]: Routledge. p.172, and Book of the Foxrook; transcription on Tolkien i Esperanto; the text begins with "PRIVATA KODO SKAŬTA" (Private Scout Code)
Smith, Arden R. (2006). «Esperanto». In: Drout, Michael D. C.J. R. R. Tolkien Encyclopedia: Scholarship and Critical Assessment. [S.l.]: Routledge. p.172, and Book of the Foxrook; transcription on Tolkien i Esperanto; the text begins with "PRIVATA KODO SKAŬTA" (Private Scout Code)
Korĵenkov, Aleksander; Korženkov, Aleksandr (2010). Zamenhof: the life, works and ideas of the author of Esperanto. New York: Mondial. ISBN978-1-59569-167-5. LCCN2010926187
Smith, Arden R. (2006). «Esperanto». In: Drout, Michael D. C.J. R. R. Tolkien Encyclopedia: Scholarship and Critical Assessment. [S.l.]: Routledge. p.172, and Book of the Foxrook; transcription on Tolkien i Esperanto; the text begins with "PRIVATA KODO SKAŬTA" (Private Scout Code)
