Williams, Kate
MacMillan Press , 1989
Buku Teks
Langan, John, 1942-, author
McGraw-Hill, 1992
Buku Teks
McWhorter, Kathleen T., author
Pearson/Longman, 2007
Buku Teks
Mather, Peter, author
McGraw-Hill, 2012
Buku Teks
Mather, Peter, author
McGraw-Hill, 2016
Buku Teks