Gaya APA
NATEROP, B., REVELL, R.
(1993).
Telephoning in english
(
8th ed.)
.
Australia:
Cambridge University Press.
Gaya MLA
NATEROP, B.Jean., REVELL, Rod.
"Telephoning in english".
8th ed.
Australia:
Cambridge University Press,
1993.
Buku.