International Congress of Physiological Sciences, Bhatia, B., Chhina, G. S., & Singh, B. (1975). Selected topics in environmental biology: Based on the sessions on environmental biology held at the XXVI International Congress of Physiological Sciences, New Delhi, October 20-26, 1974. Interprint Publications.

International Congress of Physiological Sciences, Balraj Bhatia, G. S. Chhina, and Baldev Singh. Selected Topics in Environmental Biology: Based on the Sessions on Environmental Biology Held at the XXVI International Congress of Physiological Sciences, New Delhi, October 20-26, 1974. New Delhi: Interprint Publications, 1975.

International Congress of Physiological Sciences, et al. Selected Topics in Environmental Biology: Based on the Sessions on Environmental Biology Held at the XXVI International Congress of Physiological Sciences, New Delhi, October 20-26, 1974. Interprint Publications, 1975.