Jahnel, Franz (1965). Manual of Guitar Technology: The History and Technology of Plucked String Instruments (Fachbuchreihe Das Musikinstrument, Bd. 37). стр. 15. ISBN0-933224-99-0. „There have been some uncertain presumptions concerning the "invention" of the bowed harp...The "musical bow" conjectured by many music scholars is not definitely recognizable in any cave paintings. The fact that some African negroes held the end of their bow-shaped harp in their mouths in order to improve the tone...should not be taken as proof that the first European bowmen were also conversant with the musical bow.”
harphistory.info
Campen, Ank van. „The music-bow from prehistory till today”. HarpHistory.info. Архивирано из оригинала 2. 4. 2015. г. Приступљено 26. 3. 2015. „A cave-painting in the "Trois Frères" cave in France dating from about 15,000 years ago. The magician-hunter plays the musical bow.”CS1 одржавање: Формат датума (веза)
Campen, Ank van. „The music-bow from prehistory till today”. HarpHistory.info. Архивирано из оригинала 2. 4. 2015. г. Приступљено 26. 3. 2015. „A cave-painting in the "Trois Frères" cave in France dating from about 15,000 years ago. The magician-hunter plays the musical bow.”CS1 одржавање: Формат датума (веза)