Faeries
by: Brian Froud and Allan Lee

An Encyclopedia of Faeries: Hobgoblins, brownies, bogies, and other supernatural creatures
by: Katharine Briggs

The Fairies in English Tradition and Literature
by: Katharine Briggs

The Folk-Lore of Plants
by: T.J. Thielston-dyer

The Historical Overview of the Wherebouts of Gnomes and Elves, Fauns and Faeries, Goblins, Ogres, Trolls and Bogies, Nymphs, Sprites, and Dryads, Past and Present
by: Mat Jacobson under the alias Buck Young