Nwoga Anayochi. M., et al. “ASSESSMENT OF INTRINSIC AND EXTRINSIC MOTIVATION LEVEL IN LEARNING MATHEMATICS USING MANIPULATIVES AMONG EARLY CHILDHOOD CARE EDUCATION PRE-SERVICE TEACHERS”. International Journal of Research in Education and Sustainable Development, vol. 3, no. 12, Dec. 2023, pp. 7-18, https://www.openjournals.ijaar.org/index.php/ijresd/article/view/302.