Gaya APA

Effendi, /, D, A, S. (2008). Developing english competencies 1: for Senior High School (SMA/MA) grade X . Jakarta: Pusat Perbukuan, Departemen Pendidikan Nasional.

Gaya MLA

Effendi, /Achmad, Doddy,, Ahmad, Sugeng,. "Developing english competencies 1: for Senior High School (SMA/MA) grade X". Jakarta: Pusat Perbukuan, Departemen Pendidikan Nasional, 2008. Electronic Resource.