Catanghal, Joe-Ann B., and Ricardo A. Catanghal Jr. “Teachers Performance and Level of Happiness in the Mono-Grade and Multi-Grade Class”. Abstract Proceedings International Scholars Conference 6, no. 1 (October 29, 2018): 303. Accessed March 29, 2024. https://jurnal.unai.edu/index.php/isc/article/view/1306.