Horhern C, Dangchamroon A. A development of Electronic books (E-Bookss) in Mathematics subject on addition subtraction integers for Mathayomsuksa 1 Students Bankaeng School. jomld [internet]. 2023 Jul. 11 [cited 2026 Oct. 14];8(8):296-309. available from: https://so06.tci-thaijo.org/index.php/jomld/article/view/262114