Gaya APA
SUKUR, S, G., SUSI, A. (2012).
Contextual Tenses for Effective English Communication (Cet. 10).
Jakarta:
Bhuana Ilmu Populer.
Gaya MLA
SUKUR, Silvester, Goridus., SUSI, Apriliana.
"Contextual Tenses for Effective English Communication".
Cet. 10
Jakarta:
Bhuana Ilmu Populer,
2012.
Text.