References :
1. Sikh Rahit Maryada. Amritsar, 1975
2. Kahn Singh, Bhai, Gurushabad Ratnakar Mahan Kosh [Reprint]. Patiala, 1983
3. Harbans Singh, Berkeley Lectures on Sikhism. Delhi, 1983
4. Cole, W. Owen, and Piara Singh Sambhi, The Sikhs : Their Religious Beliefs and Practices. Delhi, 1978