↑ Thanh NienBusiness of Art - Non La Theater 17 Feb 2012 "Every 50-minute show, titled Ngoc Viet (Vietnamese pearl), will feature various forms of traditional music, including the Hue royal music, gongs from the Central Highlands, đàn đá (a lithopone, an ancient musical instrument comprising 11 slabs of stone), and lục cúng hoa đăng (a dance with lotus-shaped lanterns, adapted from Buddhism).
↑ Theo nghệ sĩ nhân dân Đỗ Lộc thì cho đến nay ngoài Việt Nam ra, thế giới chưa có đàn đá đúng nghĩa. Ở một số tộc người châu Phi, Ấn Độ, Trung Hoa cổ đã xuất hiện những thanh đá phát ra âm thanh, nhưng đó chỉ là những chiếc "khánh" đá có âm vực đơn giản không đủ khả năng diễn tấu như các bộ đàn đá tìm thấy ở Việt Nam. Tuy nhiên, có báo (như ) cũng gọi tên một số nhạc cụ của nước ngoài là đàn đá.
↑ The Garland handbook of Southeast Asian music Terry E. Miller, Sean Williams - 2008 "Lithophones The oldest extant Southeast Asian musical instruments are the lithophones unearthed in Vietnam since about 1950 (Figure 4.1). Some nine or ten sets have been discovered, but they have attracted little attention from prehistoric specialists despite their having come to light over fifty years ago (Condominas 1952). Each set consists of eight to twelve narrow, variously shaped stones, each capable of producing a pitch when struck with a hammer. Since no one knows when they were made, by whom, or for what reason, it follows that we know nothing of the music played on them. They are likely associated with some phase of the Hoabinhian culture, dating from ten thousand to a few thousand years ago. Ancient lithophones are still being discovered, and copies of them are being made on which newly composed music is performed."
