Wahyuni, S. et al. 2018. THE IMPLEMENTATION OF PICTURE SERIES TO IMPROVE STUDENTS SPEAKING ABILITY AT THE SECOND GRADE OF SMP MUHAMMADIYAH 3 JETIS PONOROGO IN ACADEMIK YEAR 2016/2017. EDUPEDIA. 2, 2 (Sep. 2018), 148–160. DOI:https://doi.org/10.24269/ed.v2i2.147.