Keller, Edward A., author
Universitas Indonesia, 2011
Buku Referensi
Keller, Edward A., author
John Wiley & Sons, 2014
eBooks
Albert Zeyer
Springer, 2012
eBooks
Simmers, Louise M., author
Delmar Cengage Learning, 2009
Buku Teks
Xi, Qiaojuan (席巧娟), editor
China Intercontinental Press, 2010
Buku Teks