Gaya APA

widyantoro, A. et al (2008). Effective Communication An Integrated Course of English for Vocational High School . Jakarta: Pusat perbukuan,Departemen Pendidikan Nasional.

Gaya MLA

widyantoro, Agus. et al. "Effective Communication An Integrated Course of English for Vocational High School". Jakarta: Pusat perbukuan,Departemen Pendidikan Nasional, 2008. Text.