Gaya APA

Kristianto, L. (2003). English For Special PurposesrnConversational ApproachrnTelephone (ed. 6 2003). JAKARTA: Visipro.

Gaya MLA

Kristianto, Lanny. "English For Special PurposesrnConversational ApproachrnTelephone". ed. 6 2003 JAKARTA: Visipro, 2003. Text.