APA Style
Firdaus, Muhamad, Edi Purnama. (2013).
Negative Politeness Strategis in University English Businness Letters : A Pragmatic Study .
:
.
Chicago Style
Firdaus, Muhamad, Edi Purnama.
Negative Politeness Strategis in University English Businness Letters : A Pragmatic Study.
:
,
2013.
.
MLA Style
Firdaus, Muhamad, Edi Purnama.
Negative Politeness Strategis in University English Businness Letters : A Pragmatic Study.
:
,
2013.
.
Turabian Style
Firdaus, Muhamad, Edi Purnama.
Negative Politeness Strategis in University English Businness Letters : A Pragmatic Study.
:
,
2013.
.