Kipping, F.B.
W & R Chambers, 1957
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Griffin, Rodger W., author
McGraw-Hill, 1969
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Beyer, Hans, author
[Publisher not identified], [Date of publication not identified]
Buku Teks
Interscience Publishers, 1956
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Hart, Harold, 1922-, author
Houghton Miffiln, 1991
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