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- Peretti, Adolf; Francesca Peretti; Anong Kanpraphai; Willy Peter Bieri; Kathrin Hametner; Detlef Günther. "Winza Rubies Identified". Gem Research. Retrieved 6 March 2016.
- Pardieu, Vincent (12 February 2009). "The Winza ruby and Sapphire mining area, Mpwapwa district, Dodoma province, Tanzania". Retrieved 6 March 2016.