Gaya APA
Langan, John. (c2008).
English skills with readings (7th ed.).
mau:
McGraw-Hill Higher Education.
Gaya Chicago
Langan, John.
English skills with readings.
7th ed.
mau:
McGraw-Hill Higher Education,
c2008.
Buku.
Gaya MLA
Langan, John.
English skills with readings.
7th ed.
mau:
McGraw-Hill Higher Education,
c2008.
Buku.
Gaya Turabian
Langan, John.
English skills with readings.
7th ed.
mau:
McGraw-Hill Higher Education,
c2008.
Buku.