Comparison of Tongkat Ali Root Chemical Composition Extracted by Soxhlet, Conventional Steam and Microwave Assisted Extraction Techniques, Najmuldeen, Ghazi Faisal, Narayanan Kamalanathan, Kirubananthan Deeveeya A. /P., and Faisal Ghasak Ghazi , Pharmacognosy Journal, August 2018, Volume 10, Issue 5, p.916-920, (2018)