Thatchatham, Chanikarn, and Nattama Pongpairoj. 2025. “The Role of Input Frequency and Different Proficiency Levels on the Perception of English Nominal Suffixes by L1 Thai Learners: A Case of the Usage-Based Account”. LEARN Journal: Language Education and Acquisition Research Network 18 (1):883-913. https://doi.org/10.70730/VDET8305.