Yada Chavalkul. (2023) Packaging design tool: The effectiveness of opening indications for older people. <i>Humanities, Arts and Social Sciences Studies</i>, <i>23</i>(2), 445 464.Yada Chavalkul. "Packaging design tool: The effectiveness of opening indications for older people". Humanities, Arts and Social Sciences Studies 23 (2023):445 464.Yada Chavalkul. Packaging design tool: The effectiveness of opening indications for older people. Silpakorn University Research Innovation and Creativity Administration Office:ม.ป.ท. 2023.