Gaya APA

Riyanto, S. (2008). Gateway English For Active Communication / Slamet Riyanto (Cet. 5). Yogyakarta: Pustaka Pelajar.

Gaya MLA

Riyanto, Slamet. "Gateway English For Active Communication / Slamet Riyanto". Cet. 5 Yogyakarta: Pustaka Pelajar, 2008. Text.