Gaya APA
, ., Education, P. (2002).
Longman Student Grammar of Spoken and Written English Workbook .
Pearson Education ESL, 2002:
.
Gaya MLA
, ., Education, Pearson.
"Longman Student Grammar of Spoken and Written English Workbook".
Pearson Education ESL, 2002:
,
2002.
.