A. J. Ellorin and J. R. Etrata-Jimlani, “Trainers’ and Trainees’ Level of Competence in Technical Vocational Education and Training: Basis for Competency Development Plan”, Int. J. Sustain. Integr. Stud., vol. 1, no. 2, pp. 499–505, Sep. 2026, doi: 10.65339/ijsis.V1.I2.107.