1. Asolkar, L. V., Kakkar, K. K. and Chakre, O. J. 1992. Second Supplement to Glossary of India. Medicinal plants with Active Principle part-I (A-K) CSIR New Delhi.
2. Bhalla, V. 1942. Life-history of Euphorbia helioscopia Linn.- Proc. Indian Sci. Congr. 28 pt. 3: 16: 162.
3. Doida, Y. 1962. Consideration on the intrageneric differentiation in Polygonum. Jour. Jpn. Bot. 37(1): 3-12.