Listanto, Virgiawan, Janu Arlinwibowo, Anggraeni Dian Permatasari, Khofifa Najma Iftitah, and Ence Oos Mukhamad Anwas. “Which Is Better: E-Book or Printed Book? A Meta-Analysis of Educational Materials in Language Learning”. The International Review of Research in Open and Distributed Learning 26, no. 3 (August 14, 2025): 170–192. Accessed August 9, 2026. https://www.irrodl.org/index.php/irrodl/article/view/8468.