Wetwitayaklung, Penpun, 		Phaechamud, Thawatchai, AND 		Keokitichai, Sindhchai.
" The Antioxidant Activity of Caesalpinia sappan L. Heartwood" <em>Naresuan University Journal: Science and Technology (NUJST)</em> [Online], Volume 13 Number 2 (1 August 2013)