1.
Ulkhaq MM, Adyatama A. Clustering countries according to the world happiness report 2019. Eng Appl Sci Res [internet]. 2021 Mar. 28 [cited 2026 Oct. 8];48(2):137-50. available from: https://ph01.tci-thaijo.org/index.php/easr/article/view/240569