From the New Grove Encyclopedia of World Music Joel Sachs (Translated by Shigeo Osaki)

Johann Nepomuk Hummel -The Life and World of a Musician- Mark Kroll / Foreign Book

Kapellmeister in England and France by Joel Sachs

Hummel's List of Works with Theme Score by Zinmershid

Between Classicism and Classicism - Johann Nepomuk Hummel in Vienna and Weimar

Hummel: Complete Piano Works (facsimile score) by Joel Sachs / Foreign book

History of Western Music (Part 2) Minao Shibata / Ongaku no Tomosha

Music History Series 4 Classical Music Written by R.G. Polley / Tokai University Press

Music History Series 5 Romantic Music Written by R.M. Ronyear / Tokai University Press

History of the Pianist by Paul Lorenz / Geijutsu Gendaisha

The Virtuosos of Paris -The Age of Chopin and Liszt- Wilhelm von Lentz / Chopin

Freemasons and Great Musicians Susumu Yoshida / Kokusho Publishing Association

Schubert Life and Works Written by Haruko Fujita / Ongakunotomosha

Salieri ~ Court Musician Erased by Mozart ~ Written by Akiyoshi Mizutani / Ongaku no Tomosha

Classical Music History Modern Europe: The Beginning and End of Romanticism by Toyama Kazuyuki / Chopin

History of Piano Performance in Literature by Uli Morzen / Sinfonia

Karl Czerny ~The Musician Imprisoned on the Piano~ Written by Grete Wehmeier / Ongaku no Tomosha

Dictionary of Classical Composers Supervised by Nakagawara/Edited by Phoenix Planning/Tokyodo Publishing

Piano in Edo ~From Baroque Ieyasu to Romantic Yoshinobu~ by Kyoji Takemoto/Michitani

Clementi - Life and Music - by Leon Plantinga / Ongaku no Tomosha

Chopin's Pianism Written by Ichiro Kato / Ongakunotomosha

Autobiography of a Musician Quantz, Benda, E. Bach, Czerny Translated by Seiichi Higashikawa / Shunjusha

Pianists of the 19th Century Written by Hachiro Senzo / Ongaku no Tomosha

Habsburg Musicians Written by Camilo Schaefer / Ongaku no Tomosha

Definitive Edition Chopin's Life Written by Barbara Smolenska-Zielinska

Social History of Musicians: Musical Life in 19th Century Europe Written by Minoru Nishihara / Ongaku no Tomosha

The History of the Piano-Transitions of Musical Instruments and the Story of Musicians- Makoto Omiya / Ongaku no Tomosha

Birth of the Piano Minoru Nishihara / Ongaku no Tomosha

The Marriage of Constanze Mozart

Pianist Interesting Trivia Encyclopedia by Yukiko Hagitani / YAMAHA

I want to be a pianist ~Another music history of the 19th century~ Written by Akio Okada / Shunjusha

100 lessons that a great pianist wants to tell you Hachiro Senzo / Shunjusha

Great Composer Series List Written by Everett Helm / Ongaku no Tomosha

Great Composer Series Chopin Camille Boulnicer / Ongakunotomosha

Great Composer Series Schubert by Ernst Hilmer / Ongaku no Tomosha

Great Composer Series Mendelssohn Hans Christoph Worps / Ongakunotomosha

Great musicians and people works series 2 Haydn by Makoto Omiya / Ongaku no Tomosha

Great musicians and people works series 3 Mozart Satoshi Ebisawa / Ongaku no Tomosha

Great musicians and people works series 4 Beethoven Kunio Otsuki / Ongaku no Tomosha

Great musicians and people works series 7 Chopin Tetsutaro Kawakami / Ongaku no Tomosha

Many other CD commentaries, information on the Internet, etc.