Raymond Schwartz (1894-1973)
(Tonkin 1977) ; (Tonkin et Fettes 1996 : 122‑145) ; (Soros 2001 : 144‑156)
Bibliografio
Soros T. – Masquerade: dancing around death in Nazi-occupied Hungary, Arcade Pub., New York, 2001
Tonkin H. – Esperanto and international language problems: a research bibliography, Esperantic Studies Foundation, Washington, 1977
Tonkin H. et Fettes M. – Esperanto studies: an overview, Universala Esperanto-Asocio, Rotterdam, Netherlands, 1996.