R. J. Calimquim, J. A. Lluvido, J. Villaraza, J. Monteron, J. Parba, and R. Pecajas, “Language Learning Investment and Students’ Attitude Towards School-Related Factors Among Maritime Students ”, IJERIP, vol. 2, no. 4, pp. 985–999, Apr. 2026, doi: 10.5281/zenodo.19706753.