www.jsbachcellosuites.com
Bach Cello Suites manuscript comparison website (free access)
www.bach-leipzig.de/en/bach-archiv
The Bach Archive and Research Institute in Leipzig
www.bach-cantatas.com
A website to explore the complete Bach Cantatas
www.amazon.co.uk/Bach-Art-Improvisation-Pamela-Ruiter-Feenstra
Bach and the Art of Improvisation