Percussion instruments and their history http://books.google.com.vn/books? id=a8V3Z6j2ExEC&pg=PA265&lpg=PA265&dq=triango
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Percussion instruments and their history http://books.google.com.vn/books? id=a8V3Z6j2ExEC&pg=PA265&lpg=PA265&dq=triangolo+instrument+percussion&sou rce=bl&ots=AW1MSzmnMI&sig=3zmSRJeUR6degx7TFL2d1Oucqh4&hl=vi&ei=XFc USrysJJeIkAWThpmDDw&sa=X&oi=book_result&ct=result&resnum=1#PPA429,M1