Richards, Charles, author
McGraw-Hill, 2012
Buku Teks
Ni, Xia, author
China Renmin Universitiy, 2015
eBooks
Blanchard, Kenneth H., author
Berkley Books, 1982
Buku Teks
Kuther, Tara L., editor
Thomson, 2006
Buku Teks
Feldman, Robert S., author
McGraw-Hill, 2013
Buku Teks