References
# Sabadarth Sri Guru Granth Sahib Ji. Amritsar, 1964 # Jodh Singh, Bhai, Gurmat Nirnaya. Ludhiana, 1932 # Sher Singh, The Philosophy of Sikhism. Lahore, 1944 # Avtar Singh, Ethics of the Sikhs. Patiala, 1970 # Nirbhai Singh, Philosophy of Sikhism. Delhi, 1990 Above adapted from article By L. M. Joshi