Capitulo, Florante M.
Mathematics of investment : a simplified approach
National Book Store, 1994
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Armstrong, James W.
Elements of mathematics
Macmillan, 1976
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Campbell, Hugh G.
Finite mathematics
Macmillan, 1974
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Rothenberg, Ronald I.
Finite mathematics
John Wiley & Sons, 1980
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Drooyan, Irving
Intermediate mathematics
Wadsworth, 1971
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