republishing older editions. Parts of this edition are also sometimes encountered in electronic format from various websites that offer online sheet music. Archival materials of the AMA belong to the fonds 21081 Breitkopf & Härtel, Leipzig, in the Sächsisches Staatsarchiv, Staatsarchiv Leipzig, first of all engraver's models and proof prints, partly correspondence with editors. References Wolfgang Rehm, "Collected Editions," in H.C. Robbins Landon, ed., The Mozart Compendium: A Guide to Mozart's Life and Music. (NY: Schirmer Books, 1990.) . P. 427. Rehm, p. 428. Frederick Neumann, Ornamentation and Improvisation in Mozart. (Princeton, NJ: Princeton University Press, 1986.) . P. ix. Alfred Einstein, Mozart: His Character, His Work. Trans. Arthur Mendel and Nathan Broder. (London: Oxford University Press, 1945.) . P. 314. Friedrich Blume, "The Concertos: (1) Their Sources," in H.C. Robbins Landon and Donald Mitchell, eds., The Mozart Companion. (NY: Norton, 1956.) . P. 231. Stanley Sadie, The New Grove Mozart (NY: Norton, 1983). . Pp. 193, 197 (Mozart work list). External links Piano sonatas scanned from volume 20 of the Alte Mozart-Ausgabe. Mozart