Najim, M.M.M.2016-06-232016-06-232015Najim, M.M.M. 2015. Lesson 20: Designing a simple micro-irrigation system, In: Practical Manual for GCE A/L Biosystem Technology Teachers. Ministry of Education and University of Kelaniya, Sri Lanka. 135-142 pp.978-955-4563-50-6http://repository.kln.ac.lk/handle/123456789/13661enLearning Object