Z. W. M. Warouw, N. A. B. Karo, and F. N. Nanlohy, “Kesulitan Belajar Siswa dalam Memahami Konsep Virus di SMA Negeri 1 Tondano: Students’ Learning Difficulties in Understanding the Concept of Viruses at SMA Negeri 1 Tondano”, Edu Cendikia, vol. 5, no. 02, pp. 577–590, Sep. 2025.