References :
1. Macauliffe, Max Arthur, The Sikh Religion : Its Gurus, Sacred Writings and Authors. Oxford, 1909
2. Grewal,J.S., Guru Nanak in History. Chandigarh, 1969
3. McLeod, W.H., tr., The B40 Janam-Sakhi. Amritsar, 1980
4. Kohli, Surindar Singh, ed., Janam Sakhi Bhai Bala. Chandigarh, 1975
5. Vir Singh, Bhai, ed., Puratan Janam Sakhi. Amritsar, 1971
6. Gian Singh, Giani, Twarikh Guru Khafsa. Patiala, 1970