Sihombing, Debby Oktoberliana, dan Herbert Sipahutar. “THE EFFECT OF USING FIRING LINE LEARNING MODEL TOWARD BIOLOGY LEARNING OUTCOMES OF STUDENTS ON SUB-TOPIC PLANT TISSUES”. Jurnal Pelita Pendidikan 5, no. 1 (Maret 31, 2017). Diakses Agustus 2, 2025. https://jurnal.unimed.ac.id/2012/index.php/pelita/article/view/8440.