Kooner, Kulwant Singh. Some hidden facts Martyrdom of Shaheed Bhagat Singh : secrets unfolded by an Intelliglence Bureau Agent of British-India / Kulwant Singh Kooner and Gurpreet Singh Sindhra. - Chandigarh : Unistar Books, 2005. - 183p. ISBN: Rs.295/- Subjects--Topical Terms: Bhagat Singh--Revolutionaries--Biography--India.Martyrs.India--Freedom fighter.