O.M, Olayiwola, Agboluaje S. A, Fantola J. O, and Amalare A.A. “ANALYSIS OF NIGERIA GROSS DOMESTIC PRODUCT USING PRINCIPAL COMPONENT ANALYSIS”. JOURNAL OF ADVANCES IN MATHEMATICS 10, no. 6 (May 18, 2015): 3546–3555. Accessed June 26, 2025. https://www.rajpub.com/index.php/jam/article/view/1706.