Rika Afriana and Tri Yuliawan 2024. Analysis of Language Errors at the Morphological Level in Students’ Papers at the Islamic University of Riau . RETORIKA: Jurnal Ilmu Bahasa. 10, 2 (Jul. 2024), 440–454. DOI:https://doi.org/10.22225/jr.10.2.2024.440-454.