Riyanto, S. (2007). The 1st Student's Choice Toefl Preparation: Test Of English As A Foreign Language/ Slamet Riyanto. Yogyakarta:4b Pustaka Pelajar.
Lua i Stíl Chicago (17ú heag.)Riyanto, Slamet. The 1st Student's Choice Toefl Preparation: Test Of English As A Foreign Language/ Slamet Riyanto. Yogyakarta:4b Pustaka Pelajar, 2007.
Lua MLA (8ú heag.)Riyanto, Slamet. The 1st Student's Choice Toefl Preparation: Test Of English As A Foreign Language/ Slamet Riyanto. Yogyakarta:4b Pustaka Pelajar, 2007.
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