References :
1. Bachitra Natak
2. Santokh Singh, Bhai, Sri GUI` Pratap Sura] Gnmth. Amritsar, 1927-35
3. Gian Singh, Giani, Twankh Guru Khalsa [Reprint]. Patiala, 1970
4. Macauliffe, Max Arthur, The Sikh Religion : Its Gurus, Sacred Writings and Authors. Oxford, 1909