Autore:Charles Robert Richet

- ↑ Catalogo Vegetti della letteratura fantastica
- ↑ Fonte
- ↑ 3,0 3,1 Gemeinsame Normdatei
- ↑ data.bnf.fr
- ↑ 5,0 5,1 Encyclopædia Britannica
- ↑ Internet Speculative Fiction Database
- ↑ Library of Congress Authorities
- ↑ www.accademiadellescienze.it
- ↑ Grande Enciclopedia Sovietica 1969–1978
- ↑ Who Named It?
- ↑ Brockhaus Enzyklopädie