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Shamsudin, N.H. 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) (Mar. 2021), 29–36. DOI:https://doi.org/10.15282/ijhtc.v6i(S2).6247.