Khaodee, Warangkhana, 		Poti, Nujjarin, AND 		Kunthadee, Phetlada.
" Simple Detection Kit for Copper (II) Ion in Water using Solid Sorbent Modified with Cyanidin Extracted from Red Cabbage" <em>Naresuan University Journal: Science and Technology (NUJST)</em> [Online], Volume 29 Number 3 (10 February 2021)