Sukur, S. G. (2011). Top toefl grammar strategy: Jurus jitu melejitkan skor toefl di atas 550. Jogja Bangkit Publisher.
Chicago Style (17th ed.) CitationSukur, Silvester Goridus. Top Toefl Grammar Strategy: Jurus Jitu Melejitkan Skor Toefl Di Atas 550. Jogja Bangkit Publisher, 2011.
MLA (8th ed.) CitationSukur, Silvester Goridus. Top Toefl Grammar Strategy: Jurus Jitu Melejitkan Skor Toefl Di Atas 550. Jogja Bangkit Publisher, 2011.
Warning: These citations may not always be 100% accurate.