Tumbel, Ferny, et al. “Pengaruh Penggunaan Model Project Based Learning Terhadap Hasil Belajar IPA Biologi Siswa SMA Negeri 2 Tondano”. J-CEKI : Jurnal Cendekia Ilmiah, vol. 4, no. 3, Mar. 2025, pp. 1233-44, doi:10.56799/jceki.v4i3.8608.