Mathematics for business, management, and economics : a systems modelling approach / D.J. Harris. Harris, D. J., M.Sc. Business mathematics. Economics, Mathematical. Management Mathematics. HF5691 .H296 1985 658.4033 19 HAM Includes index. Bibliography: p. [379-380] Chichester [West Sussex] : E. Horwood ; New York : Halsted Press, [1985] [1985] 1985 Text 392 p. : eng Mathematics and its applications Ellis Horwood series in mathematics and its applications.