Within Agent Lambda's large office all the walls (except for the one with console) are covered by bookcases full of leather-bound volumes, dog-eared paperbacks, student notebooks with tea spilled on them, papyruses, parchment manuscripts, and other pieces of writing. There are literary works, scientific studies, humorous writings, and all possible writings by Elves, about Elves, or even remotely concerned with the Elves.
Lambda sees you enter, opens her sleepy eyes and shows you around the place...
"You know why I am called Agent Lambda? No? You see, Lambda comes from Quenya word 'lambengolmë', which means, roughly, "a linguist." Someone who studies languages. Oh yes, dear, it is "languages." Exactly that. Do you know how many there are? One? No, who has a better answer? Three? Nope. You see, there are Quenya and Sindarin, but there are also Avarin, and Telerin, and Nandorin. And not to be forgotten are such dialects as Doriathrin, or old forms like Old Sindarin, Noldorin, Ilkorin, or Pra-Eldarin. Read this note, it will help you grasp the idea of who should be speaking what language, dear, it will save PPC agents a lot of time. And you, I see you already know what language your character should be speaking, you just want a good dictionary. Of course I have a couple just for you."
Take extra notice of all the wonderful links they have on these two sites. Just follow the links, and I don't doubt you will find everything you are looking for, and many things you didn't even know you were looking for. If you have any questions, I will be happy to help you in any way I can. Just send me a note in English, Russian, or German at firstname.lastname@example.org or email@example.com.