Gaya APA
Sukur, S, G. (2007).
Comprehensive English Grammar for The TOEFL Test .
Yogyakarta:
Indonesia Cerdas Yogyakarta.
Gaya MLA
Sukur, Silvester, Goridus.
"Comprehensive English Grammar for The TOEFL Test".
Yogyakarta:
Indonesia Cerdas Yogyakarta,
2007.
Text.