Doyle, S, A, C. (2022). Sherlock Holmes : Misteri Lembah Kengerian The Valley Fear (1). Yogyakarta: Laksana,.
Doyle, Sir, Arthur, Conan. "Sherlock Holmes : Misteri Lembah Kengerian The Valley Fear". 1 Yogyakarta: Laksana,, 2022. Text.