May, Claire B., author
Upper saddle river, 2009
Buku Teks
Bromage, Mary C., author
McGraw-Hill, 1979
Buku Teks
Camp, Sue C., author
Glencoe/McGraw-Hill, 2001
Buku Teks
Netzley, Michael, author
Prentice-Hall, 2001
Buku Teks
Langan, John, 1942-, author
McGraw-Hill, 2001
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