Gaya APA
Lukito, W. (1986).
English for specific purposes : dialogues for secretaries 1 / Lukito W. (cet.5).
Jakarta:
Gramedia.
Gaya MLA
Lukito, W..
"English for specific purposes : dialogues for secretaries 1 / Lukito W.".
cet.5
Jakarta:
Gramedia,
1986.
Textbook.