Gaya APA

Sondak, P., Fathuddin, . (2004). Sales persons : English for special purpose conversational approach (cet. ke-10). Jakarta: Kesaint Blanc.

Gaya MLA

Sondak, Piet., Fathuddin, . "Sales persons : English for special purpose conversational approach". cet. ke-10 Jakarta: Kesaint Blanc, 2004. Text.