Brumfiel, Charles Francis, 1914-
California State Department of Education , 1965
Buku Teks
Brumfiel, Charles Francis, 1914-
Addison-Wesley, 1962
Buku Teks
Harper & Row, 1965
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Whimbey, Arthur
McGraw-Hill, 1981
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Hirst, Ann
Prentice-Hall, 2001
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