Liew Abdullah, Nurul Hidayah, et al. “Sumbangan Pemboleh Ubah Peramal Terhadap Pengetahuan, Persepsi, Sikap Dan Tingkah Laku Murid Tahun 6 Terhadap Alam Sekitar: Contribution of Predictors of Knowledge, Perceptions, Attitudes and Behavior of Standard 6 Pupils towards Environment”. GEOGRAFI, vol. 5, no. 2, Oct. 2017, pp. 116-2, https://ejournal.upsi.edu.my/index.php/GEOG/article/view/2053.