Coyle, Diane, author
Texere, 2002
Buku Teks
Frain, H. LaRue
Hougton Mifflin Company, 1937
Buku Teks
McKenzie, Richard B., author
McGraw-Hill, 1978
Buku Teks
Craven, John, 1949-, author
Blackwell, 1984
Buku Teks
Quirk, James P.
McGraw-Hill, 1968
Buku Teks