Gaya APA
Sukur, S, G. (2008).
Comprehensive English Grammar For The Toefl Test For Beginers 1 .
Yogyakarta:
Indonesia Cerdas.
Gaya MLA
Sukur, Silvester, Goridus.
"Comprehensive English Grammar For The Toefl Test For Beginers 1".
Yogyakarta:
Indonesia Cerdas,
2008.
Buku Tex.