Rassweiler, Merrill
Macmillan, 1952
Buku Teks
Maglio, Rodolfo
Macmillan, 1985
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Dineen, Sean, author
American Mathematical society, 2005
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Roman, Steven, author
Springer-Verlag, 2012
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Budnick, Frank S., author
McGraw-Hill, 1985
Buku Teks