Goossens, M., F. Mittelbach, and A. Samarin, (2004), The LATEX Companion, 2nd Edition, Reading, Massachusetts: Addison-Wesley.
J. M. Chambers, J.M. (2008), Software for Data Analysis: Programming with R, New York: Springer.
Zikmund, W.G. (2003), Business Research Methods, 7Th Edition, Thomson
Hair, Jr., J. F., Black, W. C., Babin, B. J., Anderson, R. E., & Tatham, R. L. (2006). Multivariate Data Analysis (6th ed.). Upper Saddle River, NJ: Pearson Prentice Hall.
Cameron, C. and P. Trevidi (2005), Microeconometrics. Methods and Applications. Cambridge University Press.
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