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, [1]Arxivat 2009-01-09 a Wayback Machine.
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, [1]Arxivat 2009-01-09 a Wayback Machine.