Gaya APA
LONG, J, R, M. (1985).
Breakthrough, A Course In English Communication Practice .
WALTON STREET:
OXFORD UNIVERSITY PRESS.
Gaya MLA
LONG, J.C., RICHARDS, M.N..
"Breakthrough, A Course In English Communication Practice".
WALTON STREET:
OXFORD UNIVERSITY PRESS,
1985.
Text.