Marinah Aminuddin, F., Shafiqah Radzuan, A., Zainuddin, A., Suraya Shaharuddin, U., Onn, M., Mohamed, S., Balqis Ismail, H., Hamizah Mohd Nordin, A., & Fahmi Mustapa, R. (2018). Development of a mathematics learning tool using inventive principle. International Journal of Engineering and Technology, 7(2.14), 165-170. https://doi.org/10.14419/ijet.v7i2.14.12818