Extraction of Total Phenolics, Flavonoids and Tannins from Paederia foetida L. Leaves and their Relation with Antioxidant Activity, Ojha, Shaswat, Raj Adarsha, Roy Alokesh, and Roy Sudipta , Pharmacognosy Journal, March 2018, Volume 10, Issue 3, p.541-547, (2018)