Tibbetts, A.M.
Scott, Foresman and Company, 1979
Buku Teks
Brown, Bruce
Dickenson, 1969
Buku Teks
Smith, Wiliam F.
Harcourt Brace Jovanovich, Inc., 1983
Buku Teks
Greenberg, Florence Bonzer, author
The Bobbs-Merrill, 1967
Buku Teks
Corbett, Edward P.J., author
Scott, Foresman and Company, 1983
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