THORBURN, C. (2003). Twins / Christine Thorburn. Jakarta: Gramedia Pustaka Utama.
Lua i Stíl Chicago (17ú heag.)THORBURN, Christine. Twins / Christine Thorburn. Jakarta: Gramedia Pustaka Utama, 2003.
Lua MLA (8ú heag.)THORBURN, Christine. Twins / Christine Thorburn. Jakarta: Gramedia Pustaka Utama, 2003.
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