Artificial Languages

The Klingon Dictionary: English/Klingon, Klingon/English (Star Trek)

By Okrand, Marc

Teach Yourself Esperanto 3ED (TYL)

By John Cresswell, John Hartley, J. H. Sullivan

Concise Esperanto and English Dictionary: Esperanto-English/English-Esperanto (Teach Yourself)

By Wells, J. C.

The Lost Road and Other Writings: Language and Legend Before The Lord of the Rings

By John Ronald Reuel Tolkien, Christopher Tolkien