A. A. Saputra dan V. Shofiah, “Increasing The Study Interest: The Effectivity of Poster Group Discussion-Sticker Reward (PDG-SR) to Increase The Study Interest in English”, PSP, vol. 2, no. 1, hlm. 365–369, Des 2024, Diakses: 16 September 2025. [Daring]. Tersedia pada: https://psikologi.unair.ac.id/proceeding-series-of-psychology/index.php/psp/article/view/60