Gaya APA
Hartley, B., V, P. (1980).
Streamline english : Departures Workbook A : Lines 1-40 .
Oxford:
Oxford University Press.
Gaya MLA
Hartley, Bernard., V, Peter.
"Streamline english : Departures Workbook A : Lines 1-40".
Oxford:
Oxford University Press,
1980.
Text.