Gaya APA

Riyanto, S. (2005). Gateway english for active communication : Slamet Riyanto . Yogyakarta: Pustaka Pelajar.

Gaya MLA

Riyanto, Slamet. "Gateway english for active communication : Slamet Riyanto". Yogyakarta: Pustaka Pelajar, 2005. Text.