Paul Griffiths (24 February 1984). "Faust". The Arts. The Times. No. 61766. London. col f, p. 10.
wikipedia.org
de.wikipedia.org
"Bernard's libretto draws mainly on Faust plays and poems by Maximilian Klinger and Heinrich von Kleist." in Opera News, October 1995 (review of Bielefeld Philharmonic [de] recording of the two versions).