Nachiappan, Suppiah, et al. “Cognitive Integration of Intellectual Intelligence (IQ), Emotional Intelligence (EQ) and Spiritual Intelligence (SQ) in Transforming the Ideal Teachers”. Journal of Research, Policy & Practice of Teachers and Teacher Education, vol. 2, no. 2, Sept. 2018, pp. 48-61, https://ejournal.upsi.edu.my/index.php/JRPPTTE/article/view/156.