APA (7th ed.) Citation

Sukur, S. G. (2016). TOEFL Grammar Guide Book For Beginners. Indonesia Cerdas.

Chicago Style (17th ed.) Citation

Sukur, Silvester Goridus. TOEFL Grammar Guide Book For Beginners. Indonesia Cerdas, 2016.

MLA (8th ed.) Citation

Sukur, Silvester Goridus. TOEFL Grammar Guide Book For Beginners. Indonesia Cerdas, 2016.

Warning: These citations may not always be 100% accurate.