Gaya APA
Questions and politeness. (sa).
Cambridge:
Cambridge University Press.
Gaya Chicago
Questions and politeness.
.
Cambridge:
Cambridge University Press,
sa.
Buku.
Gaya MLA
Questions and politeness.
.
Cambridge:
Cambridge University Press,
sa.
Buku.
Gaya Turabian
Questions and politeness.
Cambridge:
Cambridge University Press,
sa.
Buku.