Gaya APA
Barnard, H. (1975).
Advance english vocabulary workbook 3-A ( Unit 1-5 ) .
Massachusetts:
Newbury House Publisher, Inc.
Gaya MLA
Barnard, Helen.
"Advance english vocabulary workbook 3-A ( Unit 1-5 )".
Massachusetts:
Newbury House Publisher, Inc,
1975.
Text.