Shanxi Jiaoyu Chubanshe, 1997
Buku Teks
Waldman, Don E., author
Pearson, 2007
Buku Teks
Lachman, Leon, author
Lea & Febiger, 1976
Buku Teks
Minshull, Roger
Hutchinson University Library, 1971
Buku Teks
Wilson, J. A. Sam, author
McGraw-Hill, 1977
Buku Teks