Gaya APA

Widyantoro, A. et al (2008). Effective Communication: an Integrated Course of English for Vocational High School- Elementary Level - 2nd Year SMK . Jakarta: Pusat Perbukuan Depdiknas.

Gaya MLA

Widyantoro, Agus. et al. "Effective Communication: an Integrated Course of English for Vocational High School- Elementary Level - 2nd Year SMK". Jakarta: Pusat Perbukuan Depdiknas, 2008. Text.