Gaya APA

Riyanto, S. (2008). A quick & effective strategy to prepare the TOEFL test : kupas tuntas strategi cepat & efektif persiapan paper-based toefl . Gorontalo: Lanskap Zaman,dan Pustaka Pelajar.

Gaya MLA

Riyanto, Slamet. "A quick & effective strategy to prepare the TOEFL test : kupas tuntas strategi cepat & efektif persiapan paper-based toefl". Gorontalo: Lanskap Zaman,dan Pustaka Pelajar, 2008. Text.