Fang Z, Yu S-C. The Impact of Dual-Level Transformational Leadership on Teachers’ OCB: The Mediating Role of Group Identification and Psychological Contracts. RJPJ [internet]. 2023 Oct. 31 [cited 2026 Sep. 12];17(54):381-40. available from: https://so05.tci-thaijo.org/index.php/RJPJ/article/view/266681