Lukman Hakim. (2007). Upgrade Yourself. Surakarta: Era Intermedia.
シカゴスタイル引用形Lukman Hakim. Upgrade Yourself. Surakarta: Era Intermedia, 2007.
MLA引用形式Lukman Hakim. Upgrade Yourself. Surakarta: Era Intermedia, 2007.
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APA引用形式