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Gaya APA
Willis, S, S.(2017).Remaja & Masalahnya ; Mengupas Berbagai bentuk Kenakalan Remaja Narkoba, Free Sex dan Pemecahannya .:Alfabeta.
Gaya MLA
Willis, Sofyan, S.."Remaja & Masalahnya ; Mengupas Berbagai bentuk Kenakalan Remaja Narkoba, Free Sex dan Pemecahannya".:Alfabeta,2017.Text.