Istanto, Wisnu, Noer Amelia, and Sapto Dwi Anggoro. “Validation and Reliability of Self-Efficacy English Learning of Health Vocational Students With Jigsaw Learning Strategy”. Anglophile Journal 3, no. 1 (October 29, 2022): 14–25. Accessed May 2, 2026. https://attractivejournal.com/index.php/anglophile/article/view/481.