London, Dobson, 1947. 160 pp. Cloth w.dj. ¶ "A detailed comparative study of interlinguistics with full grammatical details of five systems of demonstrated usefulness, Esperanto, Ido, Occidental, Novial and Latino sine flexione." (text on dj.)
Language and Beyond. Actuality and virtuality in the relations between word, image and sound. / Le langage et ses au-delá. Actualité et virtualité dans les rapports entre le verbe, l'image et le son.
Amsterdam, Rodopi, 1998. xxxii, 498 pp. W.16 pl. Pbk. (Textxet 17; bilingual edition)