Ula, Faza Khilyatin, et al. “Pengaruh Predict-Observe-Explain Terhadap Higher Order Thinking Skills Siswa Pada Materi Plantae”. Jurnal BIOEDUIN, vol. 12, no. 2, Sept. 2022, pp. 92-101, doi:10.15575/bioeduin.v12i2.20121.