The compilation of information on this site is not to be republished on other sites without express permission from myself. This is partly because the research is continuous and is liable to be updated as new information comes to light, and I want one authoritative source only; partly because it is my work and I am asserting that expicitly by this statement; and partly because I do not want it to be used for any commercial or quasi-commercial purposes, thereby undermining my permission to cite source material in a not-for-profit capacity.
It draws in part on other Internet data sources such as the Kennersley languages list and FOLDOC, but for the most part on contemporary sources going back to the c19.
Please see the Thanks and acknowledgements and References for more details.