6Wolfram Schwinger. Krzysztof Penderecki, His Life and Work: Encounters, Biography and Musical Commentary,Translated by william Mann, Schott, 1989:16.
7Krzysztof Penderecki. Labyrinth of Time: Five Addresses for the End of the Millennium,Edited by Ray Robinson, Translated by william Brand, Hinshaw Music, 1998.
8Mieczyslaw Tomaszewski: "Penderecki' s Dialogs and Games With Time and Place on Earth" ,edited by Ray Robinson and Regina Chlopicka, Studies in Peuderecki, Triangle Productions, 1998:13.
9K. Robert Schwarz, "First a Firebrand, Then a Romantic. Now What?",New York Times, 20 Oct. 2006:H33.
10Scott Murphy. "A Model of Melodic Expectation for Some Neo- Romantic Music of Penderecki" ,Perspectives of New Music, 2007:19-25.
