Thamarat Jangsiriwattana และ Busaya Virakul. (2018) Transformational and transactional leadership: the features, existence, and influence. National Institute of Development Administration:ม.ป.ท.Thamarat Jangsiriwattana และ Busaya Virakul. 2018. Transformational and transactional leadership: the features, existence, and influence. ม.ป.ท.:National Institute of Development Administration;Thamarat Jangsiriwattana และ Busaya Virakul. Transformational and transactional leadership: the features, existence, and influence. ม.ป.ท.:National Institute of Development Administration, 2018. Print.