Gaya APA

Riskiyanto, ., Hidayat, A, N. (2025). New Insight OSN Geografi SMA/MA . Jakarta: PT. Gramedia Widiasarana Indonesia.

Gaya MLA

Riskiyanto, ., Hidayat, Arif, Nur. "New Insight OSN Geografi SMA/MA". Jakarta: PT. Gramedia Widiasarana Indonesia, 2025. Text.