Gaya APA
Valentina, A. et al (2010).
MY ENGLISH WORKBOOK ! FOR SENIOR HIGH SCHOOL GRADE XII SEMESTER 1 .
Jakarta:
Erlangga.
Gaya MLA
Valentina, Anna. et al.
"MY ENGLISH WORKBOOK ! FOR SENIOR HIGH SCHOOL GRADE XII SEMESTER 1".
Jakarta:
Erlangga,
2010.
Text.