Christy, Arthur
The John Day Company, 1945
Buku Teks
Millspaugh, Arthur Chester, 1883-1955
The Brookings Institution, 1942
Buku Teks
Little,Brown and Company, 1975
Buku Teks
Shostak, Arthur B.
Macmillan Publishing Company, 1974
Buku Teks
Bennett, James T.
Springer, 2012
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