Sudargo, Fransisca, and Hernawati Hernawati. “Analyses of Using Determination Key on Vertebrate Zoology Course to Improve Classification Ability and Concept Atainment of Biology Education Students”. Jurnal Pendidikan Sains dan Matematik Malaysia 7, no. 1 (April 27, 2017): 68-75. Accessed October 3, 2022. https://ejournal.upsi.edu.my/index.php/JPSMM/article/view/2176.