(2016). R & D products Sultan Idris Education University 2016. Universiti Pendidikan Sultan Idris.
Cita Chicago Style (17a ed.)R & D Products Sultan Idris Education University 2016. Perak: Universiti Pendidikan Sultan Idris, 2016.
Cita MLA (8a ed.)R & D Products Sultan Idris Education University 2016. Universiti Pendidikan Sultan Idris, 2016.
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