Shamsudin, Nor Hazlinda, and Zulkurnain Bin Hassan. 2021. “KEBERKESANAN TRAINER UNIT SPPD SEBAGAI ALAT BANTU MENGAJAR BAGI KURSUS PEMASANGAN DAN PENYELENGGARAAN PAIP DOMESTIK: The Effectiveness of Sppd Unit Trainers As Teaching Aids for Domestic Pipe Installation and Maintenance Courses”. International Journal of Humanities Technology and Civilization 6 ((S2):29-36. https://doi.org/10.15282/ijhtc.v6i(S2).6247.