Khofifah, U., Ratnasari, J. and Juhanda, A. 2020. Analisis Butir Soal Kemampuan Tree Thinking Pada Instrumen Uji Coba Materi Spermathophyta: (Analysis of tree thinking ability problem ability in spermathophyta trial material instruments). BIODIK. 6, 3 (Oct. 2020), 332-342. DOI:https://doi.org/10.22437/bio.v6i3.9907.