http://www.padippakam.com/padippakam/document/M_Books/m000061.pdf?fbclid=IwAR2e–kj8DnFEX9No9ADjbiSLxzN_yQ0nMymRauCWV_pJ1nrC3cV4vV1YTY

https://www.marxists.org/reference/archive/mazumdar/index.htm