OConnor, Karen, author
Addison Wesley Longman, 2001
Buku Teks
Rossiter, Clinton, 1917-1970, author
The American Library, 1960
Buku Teks
Welch, Susan, author
Thomson, 2006
Buku Teks
Patterson, Thomas E., author
McGraw-Hill, 203
Buku Teks
Beard, Charles A., author
Macmillan, 1942
Buku Teks