Crosby, Norman
Nicholson & Watson, 1948
Buku Teks
Hu, Jinguang, author
Foreign Language Press, 2009
Buku Teks
Hu, Jinguang, author
Foreign languages Press, 2009
Buku Teks
Burns, Arthur F., author
American Enterprise Institute, 1967
Buku Teks
Warfel, John H.
Lea & Febiger , 1985
Buku Teks