"Nikolaus Simrock" (in German). Stadtmuseum Bonn. 2012. Archived from the original on 27 April 2012. Retrieved 1 May 2012.
books.google.com
Donald William Krummel and Stanley Sadie, Music Printing and Publishing, Norton/Grove handbooks in music, New York: Norton, 1990, ISBN9780393028096, p. 107.
Otto Biba, "Die Simrocks—Verleger für Beethoven wie für Brahms", in Johannes Brahms und Bonn, ed. Martella Gutiérrez-Denhoff, Bonn: Stadt Bonn, Beethoven-Haus, 1997, ISBN9783922832164, p. 89(in German)
Beiträge zur Geschichte des Buchwesens 3 (1968) p. 204(in German)
The School Musician Director and Teacher 56 (1985) p. 42.
Michael Freyhan, The Authentic Magic Flute Libretto: Mozart's Autograph Or the First Full Score Edition?, Lanham, Maryland: Scarecrow, 2009, ISBN9780810869677, p. 159.
Brahms' letters to Fritz Simrock were published in 1917–19; Peter Schmitz, Johannes Brahms und der Leipziger Musikverlag Breitkopf & Härtel, Abhandlungen zur Musikgeschichte 20, Göttingen: V & R, 2009, ISBN9783899717280, p. 21 and note 23(in German)
web.archive.org
"Nikolaus Simrock" (in German). Stadtmuseum Bonn. 2012. Archived from the original on 27 April 2012. Retrieved 1 May 2012.