I want some standards plz

1. Evans WC. Trease and Evans Pharmacognosy, 15th edn. London:

W.B. Saunders, 2002, 138–9, 221–2, 336–7.

2. Markham RK. Techniques of Flavonoids Identification. London:

Academic Press, 1982, 45.

3. Hostettmann K, Martson A. Saponins. Cambridge: University Press,

1995, 233.

4. Bruneton J. Pharmacognosie Phytochimie Plantes medicinales. Paris:

TEC & DOC, 1999, 381–5