Gaya APA

DOFF, A. (2005). SPEAKING 2 + 2 KASET (BLOCKNOTE & SPEAKING) . YOGYAKARTA: KANISIUS.

Gaya MLA

DOFF, ADRIAN. "SPEAKING 2 + 2 KASET (BLOCKNOTE & SPEAKING)". YOGYAKARTA: KANISIUS, 2005. Text.