Gaya APA
Barnard, H. (1975).
Advance english vocabulary workbook 3-B ( Unit 6-10 ) .
London:
Newbury House Publisher, Inc.
Gaya MLA
Barnard, Helen.
"Advance english vocabulary workbook 3-B ( Unit 6-10 )".
London:
Newbury House Publisher, Inc,
1975.
Text.