Colfer, Eoin
Artemis fowl
Gramedia Pustaka Utama, 2018
 Buku Teks SO
Scofield, Sandra
Opal on dry ground
Ivy Books, 1994
 Buku Teks SO
Colfer, Eoin
Artemis fowl and the atlantis complex
Gramedia Pustaka Utama, 2018
 Buku Teks SO
Brown, Dan
Deception point = titik muslihat
Serambi Ilmu Semesta, 2006
 Buku Teks SO
Rudy Setiabudy
Sistem Manajemen Opal PLN Distribusi Cabang Gambir
Fakultas Teknik Universitas Indonesia, 1995
 UI - Laporan Penelitian