Kalam di Karamat (The Miracle of the Pen), which is a commentary on the work of writers from both east and west, contains an essay on the poetry of Bhai Vir Singh also, who was his elder brother. In his later years Dr. Balbir Singh started publishing through the Punjabi University, Patiala, an etymological encyclopaedia of the Guru Granth which he did not live to complete.
References :
1. Kohli, S.S., Punjabi Sahit da Itihas, Ludhiana, 1955.
2. Mohan Singh, A History of Punjabi Literature, Amritsar, 1956.
3. Sekhon, S.S. and K.S. Duggal, A History of Punjabi Literature, Delhi, 1992.