Rashtchi, Mojgan, and Parisa Yazdani. “Intentional Vocabulary Learning via WhatsApp: Does the Type of Input Matter?”. English Language Teaching Educational Journal 3, no. 2 (September 1, 2020): 118–132. Accessed May 2, 2024. http://journal2.uad.ac.id/index.php/eltej/article/view/2370.