Gaya APA
Suharsih, S. (2010).
Learning to Thank, to Apologize, and to Express Politeness .
Jakarta Timur:
PT Mulazam Mulia Utama.
Gaya MLA
Suharsih, Siti.
"Learning to Thank, to Apologize, and to Express Politeness".
Jakarta Timur:
PT Mulazam Mulia Utama,
2010.
Text.