RIYANTO, S. The First (1st) Student-s Choice TOEFL Preparation (Test of English As A Foreign Languange): Panduan praktis persiapan tes TOEFL untuk meraih skor TOEFL tinggi. Pustaka Pelajar.
Chicago Style (17th ed.) CitationRIYANTO, Slamet. The First (1st) Student-s Choice TOEFL Preparation (Test of English As A Foreign Languange): Panduan Praktis Persiapan Tes TOEFL Untuk Meraih Skor TOEFL Tinggi. Pustaka Pelajar.
MLA (8th ed.) CitationRIYANTO, Slamet. The First (1st) Student-s Choice TOEFL Preparation (Test of English As A Foreign Languange): Panduan Praktis Persiapan Tes TOEFL Untuk Meraih Skor TOEFL Tinggi. Pustaka Pelajar.
Warning: These citations may not always be 100% accurate.