References :
1. Bhalla, Samp Das, Mahima Prakash. Patiala, 1971
2. Kohli, Surindar Singh, Lannmsdkhl H/ini Kala. Chandigarh, 1975
3. Dvivedi, Ha/ari Prasad, Ndlh Samprnddyn. Varana.si, 1966
4. Jodh Singh, The Religious Philosophy of Guru Nannk. Delhi, 1989