Gaya APA
Piet, S., Fathuddin, (1993).
English for spesial purpose : salespersons / Piet Sondak; editor Fathuddin (Cet.1).
Jakarta:
Kesaint Blanc.
Gaya MLA
Sondak, Piet., Fathuddin, .
"English for spesial purpose : salespersons / Piet Sondak; editor Fathuddin".
Cet.1
Jakarta:
Kesaint Blanc,
1993.
Textbook.