Gaya APA
English as a Second Language Workbook 2. (2008).
Cambridge:
Cambridge University Press.
Gaya Chicago
English as a Second Language Workbook 2.
Third Edition.
Cambridge:
Cambridge University Press,
2008.
Buku.
Gaya MLA
English as a Second Language Workbook 2.
Third Edition.
Cambridge:
Cambridge University Press,
2008.
Buku.
Gaya Turabian
English as a Second Language Workbook 2.
Cambridge:
Cambridge University Press,
2008.
Buku.