Rahmilia, D., E. . Ardian, and Syafrizal. “THE STUDENTS’ ABILITY IN LEARNING TREE DIAGRAMS AT THE FIFTH SEMESTER STUDENTS OF ENGLISH STUDY PROGRAM ISLAMIC UNIVERSITY OF INDRAGIRI”. J-Shelves of Indragiri (JSI), vol. 4, no. 1, Nov. 2022, pp. 38-47, doi:10.61672/jsi.v4i1.2496.