Typically the wealth of completely new material on the internet is a great resource for the lexicographer, but the 
material available cannot always be used in a traditional dictionary 
because much of it is, by it is very dynamics, unstable. 
Despite the presence of careful and also detailed information about the URL, 
for example the date 
connected with access and stuff like that, the lexicographer cannot be certain that the information can be 
inspected by a dictionary user at a later time. Perhaps >this challenge will be remedied in the future, but it has not been resolved at the present, and consequently we have did not cite these kinds of material 
on the internet. Similarly, quite a few books are now being published 
throughout electronic type as well as in hard copy, and of course a lot of books will be published only in digital form. 
The challenge of balance again appears with electronic books: we 
is not certain that the electronic books now available will be 
easily obtainable in the future, or perhaps that they will offer the precise form in which they are now available. 
For this reason we have chose to adhere to the principle that may we is only going to cite proof everyjust exactly where 
we live certain that it can be immediately 
inspected in the foreseeable long term.