Gaya APA
Principles of language learning and teaching. (2000).
San francisco:
Addison-wesley publishing company.
Gaya Chicago
Principles of language learning and teaching.
4th ed..
San francisco:
Addison-wesley publishing company,
2000.
Buku.
Gaya MLA
Principles of language learning and teaching.
4th ed..
San francisco:
Addison-wesley publishing company,
2000.
Buku.
Gaya Turabian
Principles of language learning and teaching.
San francisco:
Addison-wesley publishing company,
2000.
Buku.