AUTHOR=Shalini Roy S. , Gandhimathi S. N. S. TITLE=Self-directed learning for optimizing sustainable language learning via mobile assisted language learning: a systematic review JOURNAL=Frontiers in Education VOLUME=9 YEAR=2025 URL=https://www.frontiersin.org/journals/education/articles/10.3389/feduc.2024.1463721 DOI=10.3389/feduc.2024.1463721 ISSN=2504-284X