SHYMKIW, A., & LARBALESTIER, D. (2007). Study English: IELTS preparation series one. Gramedia Pustaka Utama.
Lua i Stíl Chicago (17ú heag.)SHYMKIW, Anna, agus David LARBALESTIER. Study English: IELTS Preparation Series One. Jakarta: Gramedia Pustaka Utama, 2007.
Lua MLA (9ú heag.)SHYMKIW, Anna, agus David LARBALESTIER. Study English: IELTS Preparation Series One. Gramedia Pustaka Utama, 2007.
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