in 1942 he published the first edition of the textbook "occidental die internationale welthilfssprache". it was followed in 1945 by "wörterbuch occidental-deutsch e deutsch-occidental". this book was based upong the works of joseph gär and ric berger. after the language name was changed to interlingue, he wrote and updated the book "interlingue die natürliche welthilfssprache, für millionen geschaffen, von millionen verstanden. vollständiger lehrgang in 20 lektionen".