Apsari, Yanuarti, Isry Laila Syathroh, and Rissa San Rizqiya. 2017. “PROMOTING ENGLISH TEACHERS’ PROFESSIONAL DEVELOPMENT (TPD) THROUGH THE PRACTICE OF LESSON STUDY”. OKARA: Jurnal Bahasa Dan Sastra 11 (2), 303-18. https://doi.org/10.19105/ojbs.v11i2.1496.