Ellen Highstein: 'Yma Sumac (Chavarri, Emperatriz)', Grove Music Online, ed. L. Macy (Accessed 8 August 2006)
lexis-nexis.com
web.lexis-nexis.com
David Richards, "The Trill of a Lifetime; Exotic Singer Yma Sumac Meets a New Wave of Fans." The Washington Post, March 2, 1987, STYLE; PAGE B1. Accessed August 6, 2006, via Lexis Nexis
