Bradshaw, Thornton F.
Harvard University,, 1950
Buku Teks
Heckert, J. Brooks (Josiah Brooks), 1893-, author
Erlangga, 1996
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Willson, James D., author
John Wiley & Sons, 1981
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Heckert, J. Brooks (Josiah Brooks), 1893-, author
Ronald Press, 1963
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Simons, Robert, author
Pearson Education , 2014
Buku Teks