Dawes, M., Matthews, R., Roberts, A., & Thwaites, G. (2018). Cambridge international AS & A level thinking skills. Coursebook. Cambridge University Press.
Center for Innovation in Legal Education. (2013, November 26). Critical thinking. YouTube. https://www.youtube.com/playlist?list=PLpbtRdN7xWUcPT0qWBfC52FubQxcgdgjk
Angus Grongono, & Colin Hart (2022). Cambridge International AS & A Level Thinking Skills. Hodder Education
Jo Lally, Ruth Matthews, Alison Rowe, & Jacquie Thwaities (2008). OCR Critical Thinking AS. Pearson Education Limited.