Tài liệu mới
 Calculus / Deborah Hughes-Hallett, William G. McCallum, Andrew M. Gleason [and nineteen others] ; with the assistance of Otto K. Bretscher, Adrian Iovita, David E. Sloane, MD, Colby College University of Washington Harvard Medical School ; coordinated by Elliot J. Marks.
 Principles of macroeconomics / N. Gregory Mankiw.
 Health econometrics using Stata / Partha Deb (Hunter College, CUNY and NBER), Edward C. Norton (University of Michigan and NBER), Willard G. Manning (University of Chicago).
 An introduction to statistics and data analysis using Stata : from research design to final report / Lisa Daniels, Washington College, Nicholas Minot, International Food Policy Research Institute, Washington, DC.
 Interpreting and visualizing regression models using Stata / Michael N. Mitchell.
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