“Pengembangan Four-Tier Diagnostic Test Konsep Ekosistem: Validitas Dan Reliabilitas Instrumen: Four-Tier Diagnostic Test Instrument for Ecosystem Concept : Validity and Reliability”. BIODIK 6, no. 1 (March 1, 2020): 1–11. Accessed April 20, 2026. https://www.online-journal.unja.ac.id/biodik/article/view/8093.