Gaya APA

Sukur, S, G. (2007). Comprehensive English Grammar For The Toefl Test For Beginners 1 (1). Yogyakarta: Indonesia Cerdas.

Gaya MLA

Sukur, Silvester, Goridus. "Comprehensive English Grammar For The Toefl Test For Beginners 1". 1 Yogyakarta: Indonesia Cerdas, 2007. Text.