Gaya APA

ASTUTI, S, I. (2008). Simple Step to TOEFL From Grammar to the D-Day (1). Jakarta: PT Buku Kita.

Gaya MLA

ASTUTI, SANTI, INDRA. "Simple Step to TOEFL From Grammar to the D-Day". 1 Jakarta: PT Buku Kita, 2008. Text.