Casinillo, Leomarich Fortugaliza, et al. “Understanding Stress and Satisfaction of Private Teachers: A Correlation Analysis and K-Means Clustering”. HO CHI MINH CITY OPEN UNIVERSITY JOURNAL OF SCIENCE - SOCIAL SCIENCES, vol. 15, no. 4, May 2024, pp. 112-26, doi:10.46223/HCMCOUJS.soci.en.15.4.3205.2025.