Stine, R. (1999). The Secret = Rahasia/ R.L. Stine; penerjemah, Widya Kirana. Jakarta: Gramedia.
Lua i Stíl Chicago (17ú heag.)Stine, R.L. The Secret = Rahasia/ R.L. Stine; Penerjemah, Widya Kirana. Jakarta: Gramedia, 1999.
Lua MLA (8ú heag.)Stine, R.L. The Secret = Rahasia/ R.L. Stine; Penerjemah, Widya Kirana. Jakarta: Gramedia, 1999.
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