Bondar, Gusman Keizer, et al. “TRANSITIVITY SYSTEMS ANALYSIS OF ENGLISH FOR VOCATIONAL HIGH SCHOOL (SMK) OF SOSORGADONG TEXTBOOK FOR GRADE X AND ITS RELEVANCE TO ENGLISH LANGUAGE TEACHING”. LINGUISTIK TERAPAN, vol. 15, no. 3, Oct. 2019, doi:10.24114/lt.v15i3.14771.