Perrin, Porter G., author
Scott, Foresman, 1950
Buku Teks
Booth, Wayne C., author
Harper & Row, 1987
Buku Teks
Hammond, Eugene R., author
McGraw-Hill, 1989
Buku Teks
Wood, Nancy V., author
McGraw-Hill, 1991
Buku Teks
Langan, John, 1942-, author
McGraw-Hill , 2001
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