Nattathip Rattanasangthip และผู้แต่งคนอื่นๆ. (2026) The Effect of Assertive Leadership Development Program on Assertive Leadership Behaviors: A Case Study of Managers in a Pharmaceutical and Medical Device Company. <i>Human Resource and Organization Development Journal</i>, <i>18</i>(2), 143-168.Nattathip Rattanasangthip และผู้แต่งคนอื่นๆ. "The Effect of Assertive Leadership Development Program on Assertive Leadership Behaviors: A Case Study of Managers in a Pharmaceutical and Medical Device Company". Human Resource and Organization Development Journal 18 (2026):143-168.Nattathip Rattanasangthip และผู้แต่งคนอื่นๆ. The Effect of Assertive Leadership Development Program on Assertive Leadership Behaviors: A Case Study of Managers in a Pharmaceutical and Medical Device Company. Graduate School of Human Resource Development : National Institute of Development Administration:ม.ป.ท. 2026.