Sihombing DO, Sipahutar H. THE EFFECT OF USING FIRING LINE LEARNING MODEL TOWARD BIOLOGY LEARNING OUTCOMES OF STUDENTS ON SUB-TOPIC PLANT TISSUES. JPP [Internet]. 2017 Mar. 31 [cited 2025 Dec. 27];5(1). Available from: https://jurnal.unimed.ac.id/2012/index.php/pelita/article/view/8440