- "These facts are contained in the biographical story 'Joseph Joachim, ein Lebensbild' written by Paul Moser, in the first chapter. Moser was a pupil and close friend of Joachim, with whom he collaborated in the preparation of the biography. In the first edition of the work (Berlin 1899-?-) he refers to the violin as an Andreas Amati, in the later edition (1908) as a Petrus Guarneri, the change having probably been due to the opinion given by the Berlin dealer an connoisseur Hammig who did most of Joachim's repair work during his later years."
- "Pietro Guarneri of Venice: Son of Giuseppe Filius Andrea", Ernest N. Doring, Violins & Violinists, October, 1943, 1943.
Indicates that the owner is or was also a musician
Indicates that the musician is or was also an owner of one or more instruments
Letter: J. & A. Beare, London, September 17, 2007. "This is to confirn that we have examined the violin labelled Pietro Guarneri with the date 1747, and are of the opinion that the body of the instrument is original. The front has been completely re-edged and repurfled, an inexplicable repair that one sometimes sees, but the soundholes are just what one expects from a late Peter Guarneri of Venice. The scroll is not original."
Certificate: William Lewis & Son, Chicago, November 11, 1943. #3769.
Letter: J. & A. Beare, London, May 3, 1988
Certificate: Rudolph Wurlitzer Co., New York, May 22, 1943
"Pietro Guarneri of Venice: Son of Giuseppe Filius Andrea", Ernest N. Doring, , 1943.
"William Lewis & Son advertisement", Violins & Violinists, August-September, 1942, 1942.
Correspondence with Lykle Lykles, June, 2010.
Correspondence with owner, June, 2008.
Correspondence with owner, May, 2012.