Moore, H. I.
George Allen and Unwin, [date of publication not identified]
Buku Teks
Moore, H. I.
George Allen and Unwin, [date of publication not identified]
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Moore, David S.
W.H. Freeman and Company, 2000
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Arnold, Lois D.W., author
Jones and Bartlett, 2010
Buku Teks
Adams, Harold S.
The Commonwealth Fund, 1947
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