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.