Sehgal, Narender K Ed., Mahanti, Subodh
Memoirs of Ruchi Ram Sahni Pioneer of science popularisation in Punjab - New delhi Vigyan prasar 1997 - 189
8174800166
82-83 SEH
Memoirs of Ruchi Ram Sahni Pioneer of science popularisation in Punjab - New delhi Vigyan prasar 1997 - 189
8174800166
82-83 SEH