1. Abdullah, M. H. (1998). Problem-based learning in language instruction: A constructivist model. Eric Digest. ERIC Clearinghouse on Reading, English, and Communication. Bloomington: Indiana University. Dostupné z https://eric.ed.gov/?id=ED423550
2. Aebli, H. (1983). Zwölf Grundformen des Lehrens: Eine allgemeine Didaktik auf psychologischer Grundlage: Medien und Inhalte didaktischer Kommunikation, der Lernzyklus (15. Auflage). Stuttgart: Klett-Cotta.
3. Aliyu, M. M. (2020). Exploring the nature of undergraduates' peer collaboration in a PBL writing process. IJOLE-INTERNATIONAL JOURNAL OF LANGUAGE EDUCATION, 4(2), 11-23. https://doi.org/10.26858/ijole.v4i2.8406
4. Ansarian, L., Adlipour, A. A., Saber, M. A., & Shafiei, E. (2016). The impact of problem-based learning on Iranian EFL learners' speaking proficiency. Advances in Language and Literary Studies, 7(3), 84-94. https://doi.org/10.7575/aiac.alls.v.7n.3p.84
5. Ansarian, L., & Mohammadi, F. S. (2018). Problem-based learning in action: Review of empirical studies. Pertanika Journal of Social Sciences and Humanities, 26, 13-32.