Text book:-
Yeung, E. 1998. A beginner’s guide to the study of plant structure. Pages 125-142. Retrieved from http://www.ableweb.org/volumes/vol-19/9-yeung.pdf
Webliography:-
- www.swst.org/teach/set2/struct1.html
- cool.conservation-us.org/byorg/abbey/ap/ap04/ap04-4/ap04-402.html