Gaya APA
Asking and Thanking. (1990).
London:
SCM Press Ltd.
Gaya Chicago
Asking and Thanking.
Ketiga.
London:
SCM Press Ltd,
1990.
.
Gaya MLA
Asking and Thanking.
Ketiga.
London:
SCM Press Ltd,
1990.
.
Gaya Turabian
Asking and Thanking.
London:
SCM Press Ltd,
1990.
.