found: Wagner, R.Tannhäuser ... [Phonodisc] 1965.
found: Ww opera, 1st ed.(dramatic soprano)
found: New Grove dict. of opera(Silja, Anja; b. Apr. 17, 1935, Berlin; German soprano)
found: Wikipedia, February 11, 2014(Anja Silja; Anja Silja Regina Langwagen; born April 17, 1940, Berlin; German soprano)
found: Int. ww in classical mus., 28th ed.(Silja, Anja; born April 17, 1940, Berlin; German soprano and producer)
found: Grove music online, February 11, 2014(Silja, Anja; born April 17, 1940, Berlin; German soprano)
found: DNB in VIAF, February 11, 2014(Silja, Anja, 1940- ; real name: Langwagen, Anja Silja Regina; born April 17, 1940, Berlin; German soprano)