Gaya APA

riskiyanto, ., hidayat, A, N. (2025). new insight OSN olimpiade sains nasional geografi sma/ma . jakarta: gramedia widiasarana indonesia.

Gaya MLA

riskiyanto, ., hidayat, Arif, Nur. "new insight OSN olimpiade sains nasional geografi sma/ma". jakarta: gramedia widiasarana indonesia, 2025. .