Sari, E. N., Nilawarni, R., & Heryanti, E. (2018). The Effect of Two Stay Two Stray (TSTS) Technique of Cooperative Learning Model toward Students Biology Learning Outcomes. Biosfer: Jurnal Pendidikan Biologi, 7(1), 25-29. https://doi.org/10.21009/biosferjpb.7-1.4