餘下的3首練習曲「新練習曲三首」(Trois nouvelles études)沒有命名,亦無作品號,是在1839年為伊格納茲·莫謝萊斯和弗朗索瓦-約瑟夫·費蒂斯(英語:François-Joseph Fétis)的鋼琴教本 《Méthode des méthodes de piano》 而作,於1840至1841年發表。這3首沒有其餘的24首來的情感鮮明。
Bülow, Hans von. "Remarks on the Separate Studies." In Auserlesene Klavier-Etüden von Fr. Chopin. München: Jos. Aibl, 1880.
Collet, Robert. "Studies, Preludes and Impromptus." In Frédéric Chopin: Profiles of the Man and the Musician. Ed. Alan Walker. London: Barrie & Rockliff, 1966.
卡爾·徹爾尼. School of Practical Composition London: R. Cocks & Co., [1848]; Reprint, New York: Da Capo Press, 1979.
Deschaussées, Monique. Frédéric Chopin: 24 études – vers une interprétation. Fondettes: Van de Velde, 1995.
Eigeldinger, Jean-Jacques. Chopin: Pianist and Teacher as Seen by his Pupils. Cambridge University Press, 1986
Ekier, Jan, ed. (National Edition)."About the Etudes." "Performance Commentary." "Source Commentary." Chopin Etudes. Warsaw: Polskie Wydawnictwo Muzyczne, 1999.
Finlow, Simon. "The Twenty-seven Études and Their Antecedents." In Jim Samson (ed.), The Cambridge Companion to Chopin. Cambridge: Cambridge University Press, 1992.
Galston, Gottfried. Studienbuch. III. Abend (Frédéric Chopin). Berlin: Bruno Cassirer, 1910.
Huneker, James. "The Studies—Titanic Experiments." In Chopin: The Man and His Music. New York: Charles Scribner's Sons, 1900.
Kogosowski, Alan. "Mastering the Chopin Études." A compendium to Chopin: Genius of the Piano. E-Book, 2010.
Leichtentritt, Hugo. "Die Etüden." In Analyse der Chopin'schen Klavierwerke [Analysis of Chopin's Piano Works]. Band II. Berlin: Max Hesses Verlag, 1922.
Niecks, Frederick. Chopin as a Man and Musician. London: Novello, Ewer and Co., 1888.
Paderewski, Ignacy Jan, Ludwik Bronarski, Józef Turczynsky, ed. ("Paderewski" Edition). "The Character of the Present Edition." "Commentary." Chopin Studies (Etudes). Warsaw: Instytut Fryderyka Chopina, 1949.
Samson, Jim. "Baroque reflections." In The Music of Chopin. London: Routledge and Kegan Paul, 1985.
Schumann, Robert. "Die Pianoforte-Etuden, ihren Zwecken nach geordnet" ["The Pianoforte Études, Categorized According to their Purposes"]. Neue Zeitschrift für Musik No. 11, February 6, 1836, p. 45.