Ault, Addison, author
Houghton Mifflin, 1979
Buku Teks
Ault, Addison, author
Holbrook Press, 1973
Buku Teks
Solomons, T. W. Graham, author
John Wliley & Sons , 2011
Buku Teks
Vogel, Arthur I., author
The English Language Book Society, 1966
Buku Teks
Vogel, Arthur I., author
English Language Book Society, 1958
Buku Teks