New Grove, 2nd ed. WWW site, Feb. 11, 2002 (Boulez, Pierre; b. Mar. 26, 1925, Montbrison, Loire; French composer and conductor)
New York times WWW site, viewed Jan. 6, 2016 (Pierre Boulez; b. Mar. 26, 1925, Montbrison, near Lyon; d. Tuesday [Jan. 5, 2016], Baden-Baden, aged 90; French composer and conductor who was a dominant figure in classical music for over half a century)