Saputra, Anandhika Agus, dan Vivik Shofiah. “Increasing The Study Interest: The Effectivity of Poster Group Discussion-Sticker Reward (PDG-SR) to Increase The Study Interest in English”. PROCEEDING SERIES OF PSYCHOLOGY, vol. 2, no. 1, Desember 2024, hlm. 365-9, https://psikologi.unair.ac.id/proceeding-series-of-psychology/index.php/psp/article/view/60.