N. Fadilah and N. Efendi, “Student Pleasure Attitude and Interest in Spending Time Learning Science Against Student Cognitive Learning Outcomes: Analisis Sikap Senang Siswa Dan Minat Meluangkan Waktu Belajar IPA Terhadap Hasil Belajar Kognitif Siswa”, ijemd, vol. 2, p. 10.21070/ijemd.v2i0.551, May 2018.