1.
Croft T, Davison R. Foundation maths [Internet]. Seventh edition. Harlow, England: Pearson; 2020. Available from: https://eu.alma.exlibrisgroup.com/view/action/uresolver.do?operation=resolveService&package_service_id=4841648670002418&institutionId=2418&customerId=2415
2.
Elementary Algebra Textbook [Internet]. Available from: http://mathrev.redwoods.edu/ElemAlgText/
3.
Mathematics Enhancement Programme [Internet]. Available from: http://www.cimt.org.uk/projects/mepres/alevel/alevel.htm
4.
Underground Mathematics [Internet]. Available from: https://undergroundmathematics.org/
