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Jon, Efendi (2008) Penggunaan Silogisme dalam Terapi Rasional-Emotif pada Anak Tunagrahita Ringan. Project Report. FIP UNP, Padang.
Zainul, Rahadian and Oktavia, Budhi and Dewata, Indang and Jon, Efendi (2017) Thermal and Surface Evaluation on The Process of Forming a Cu2O/CuO Semiconductor Photocatalyst on a Thin Copper Plate. In: The 2nd International Conference on Mathematics, Science, Education and Technology, 5-6 Oktober 2017, Padang.