Gaya APA
kusrian, E. (2010).
Learning to Thank,ti Apilogize and to express Politeness (Cet 1).
Jakarta:
PT.MULTAZAM MULIA UTAMA.
Gaya MLA
kusrian, Eri.
"Learning to Thank,ti Apilogize and to express Politeness".
Cet 1
Jakarta:
PT.MULTAZAM MULIA UTAMA,
2010.
.