Creswell, J.W. & Plano Clark, V.L. (2017) Designing and Conducting Mixed Methods Research, 3rd edn. Thousand Oaks, CA: SAGE Publications. Sage College Publishing
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Ponce, O.A., Galán, J.G., Pagán-Maldonado, N. & Canales Encarnación, A.L. (2021) Introduction to the Philosophy of Educational Research. 1st edn. Aalborg: River Publishers. Routledge
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Wang, L., Peng, L. & Khan, Q. (2018) Research Methods in Education. New Delhi: SAGE Publications India Pvt. Ltd.
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