If I wanted a general introduction to for example the Turkish language, I can look up articles on Turkish in Encyclopedia Britannica, the Routledge Compendium of the World's Languages, the International Encyclopedia of Linguistics, and the Encyclopedia of Language and Linguistics, all of which are excellent resources. The articles range from a page to a few pages. I can also find overview books such as Routledge's Turkish by Jack Kornfilt or Turkish: An Essential Grammar, which are both several hundred pages.
What interests me is if there is any intermediate document between resources of these two different magnitudes. Is there any encyclopedia which provides languages up to a 20-50 page general treatment, or a dedicated Turkish language encyclopedia with a very in-depth overview article on Turkish itself, ideally 20-50 pages?
I know that I can research this myself, and I am, but I ask to discover any possible tips on places to look.