Sebastian, Y. (2013). Time Is More Valuable Than Money. Gramedia Pustaka Utama.
Lua i Stíl Chicago (17ú heag.)Sebastian, Yoris. Time Is More Valuable Than Money. Gramedia Pustaka Utama, 2013.
Lua MLA (8ú heag.)Sebastian, Yoris. Time Is More Valuable Than Money. Gramedia Pustaka Utama, 2013.
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