Constitutional Convention Committee, 1938
Buku Teks
London : Central Books Ltd
Majalah, Jurnal, Buletin
Sweezy, Paul M. (Paul Marlor), 1910-2004, author
McGraw-Hill, 1949
Buku Teks
Jacobsson, Per, author
Oxford University Press, 1958
Buku Teks
Morawetz, Cathleen S., author
Society for Industrial and Applied Mathematics, 1975
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