MARWANTO, R.; SERIBULAN, M. N. M.; ISFAENI, H. The effect of Learning Strategy of Assurance, Relevance, Interest, Assessment, and Satisfaction (Puzzle Vs Video) on Ecosystem to Students Cognitive Learning Result. Biosfer: Jurnal Pendidikan Biologi, v. 7, n. 2, p. 41-46, 18 Jan. 2018.