Gaya APA
Wardhaugh, R.
(2006).
An Introduction to Sociolinguistics FIFTH EDITION
(
Sastra Inggris)
.
Netherland:
.
Gaya MLA
Wardhaugh, Ronald.
"An Introduction to Sociolinguistics FIFTH EDITION".
Sastra Inggris
Netherland:
,
2006.
.