W, F. Rahasia sukses lulus toefl: Persiapan, bimbaingan, strategi,dan latihan soal. Datamedia.
Chicago Style (17th ed.) CitationW, FRIS. Rahasia Sukses Lulus Toefl: Persiapan, Bimbaingan, Strategi,dan Latihan Soal. Datamedia.
MLA (8th ed.) CitationW, FRIS. Rahasia Sukses Lulus Toefl: Persiapan, Bimbaingan, Strategi,dan Latihan Soal. Datamedia.
Warning: These citations may not always be 100% accurate.