APA Style

Riskiyanto, ., Hidayat, A, N. (2025). New insight OSN Geografi SMA/MA . Jakarta: Grasindo.

MLA Style

Riskiyanto, ., Hidayat, Arif, Nur. "New insight OSN Geografi SMA/MA". Jakarta: Grasindo, 2025. Buku SMA Athalia.