Philip Glass: Skirtumas tarp puslapio versijų

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Urbaitis, Mindaugas. Glass Philip. Muzikos enciklopedija. Mokslo ir enciklopedijų leidybos institutas. T. 1, 2001, p. 459.

The Nes Grove Dictionary of Music and Musicians (Edited by Stanley Sadie). T. 7, London: Macmillan Publishers, 1995, p. 427.

Trombley, Richard. Glass Philip. Encyclopedia of Music in the 20th Century (Edited by Lee Stacy and Lol Henderson). Fitzroy Dearborn Publishers, 1999, p. 250.