Bullroarer (nhạc cụ) (Vietnamese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Bullroarer (nhạc cụ)" in Vietnamese language version.

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Bayley, Harold. The Lost Language of Symbolism: An Inquiry into the Origin of Certain Letters, Words, Names, Fairy-Tales, Folklore, and Mythologies Book Tree (2000). p. 86: "The bullroarer, used always as a sacred instrument, is still employed n New Mexico, the Malay Peninsula, Ceylon, New Zealand, Africa, and Australia, and under the name of Rhombus it figured prominently in the Mysteries of Ancient Greece."