Haberman, William L., 1922-, author
Boston: Allyn and Bacon, 1980
Buku Teks
Sushkov, V.V.
"Moscow: Peace Publishers/Foreign & Languages, [19?-]"
Buku Teks
Myers, Glen E., author
Prentice-Hall, 1989
Buku Teks
Wood, Bernard D., author
Addison-Wesley, 1982
Buku Teks
Reid, Charles E. (Charles Edward), 1917-2000, author
McGraw-Hill, 1990
Buku Teks