Muhammad Yasminto 2019. The Effect of Using Free Talk Worksheets from English Planet’s Program on Speaking Achievement at the Tenth Grade Students of Vocational High School Plus Almaarif Singosari. INOVATIF: Jurnal Penelitian Pendidikan, Agama, dan Kebudayaan. 5, 1 (Feb. 2019), 162–173. DOI:https://doi.org/10.55148/inovatif.v5i1.247.