References :
1. Santokh Singh, Bhai, Sri Gur Pratap Suraj Granth. Amritsar, 1927-35
2. Gian Singh, Giani, Twarikh Guru Khalsa [Reprint]. Patiala, 1970
3. Macauliffe, Max Athur, The Sikh Religion : Its Gurus, Sacred Writings and Authors. Oxford, 1909