Gaya APA

Ag., B, S. et al (2018). Teaching Language Skills : Preparing Materials and Selecting Techniques (Fist Edition). Yogyakarta: Graha Ilmu.

Gaya MLA

Ag., Bambang, Setiadi,. et al. "Teaching Language Skills : Preparing Materials and Selecting Techniques". Fist Edition Yogyakarta: Graha Ilmu, 2018. Book.