“Literature Study of the Effectiveness of Picture Story Media in Teaching Speaking Skills for Elementary School Students: Studi Literatur Efektifitas Media Cerita Bergambar Dalam Mengajarkan Keterampilan Berbicara Siswa Sekolah Dasar”, acopen, vol. 6, p. 10.21070/acopen.6.2022.1485, Jun. 2022, doi: 10.21070/acopen.6.2022.1485.