Publisher: Leipzig: C.F. Peters, n.d.
Reprinted: Mineola, NY: Dover Publications, 1986.

Oberon, or The Elf King's Oath is a 3-act romantic opera in English with spoken dialogue; the music is by Carl Maria von Weber. The libretto by James Robinson Planché was based on the German poem Oberon by Christoph Martin Wieland, which itself was based on the epic romance Huon de Bordeaux, a French medieval tale.
The above text from the Wikipedia article "Oberon (Weber)" text is available under CC BY-SA 3.0.