Teachers’ Medicare Benevolent Fund (31 December 2005). "Hiralal Sen (in Bengali)". Archived from the original on 6 December 2006. Retrieved 1 November 2006.
Teachers’ Medicare Benevolent Fund (31 December 2005). "Hiralal Sen (in Bengali)". Archived from the original on 6 December 2006. Retrieved 1 November 2006.