McWhorter, Kathleen T., author
Pearson/Longman, 2007
Buku Teks
Wood, Nancy V., author
McGraw-Hill, 1991
Buku Teks
Smith, Brenda D., author
Longman, 2000
Buku Teks
Langan, John, 1942-, author
McGraw-Hill, 1992
Buku Teks
Williams, Kate
MacMillan Press , 1989
Buku Teks