Gaya APA

cahyati, D, N., inves, T, O, S, P. (2008). Developing english competencies 1: for Senior High School (SMA/MA) grade X . Jakarta: .

Gaya MLA

cahyati, Desi, Nur., inves, Team, Of, Setia, Purna. "Developing english competencies 1: for Senior High School (SMA/MA) grade X". Jakarta: , 2008. Text.