Following books on Microeconomics and Statistics are available over internet with certain licensing rules. Few books have limited preview permission.
Part A: Microeconomics
Pindyke and Rubinfeld. Micro Economics.
Dwivedi, D.N. Managerial Economics.
Maheswari, Y. Managerial Economics.
Gupta, G. S. Managerial Economics.
Samuelson and Nordhaus. Macroeconomics.
Mandal, R. K. Micro Economic Theory.
Wiki Books. Principles of Microeconomics.
Part B: Statistics
Srinivasa, G and George, D. Business Mathematics & Statistics.
Francis, Andre. Business Mathematics & Statistics.
Part -C: Full-text availability in Internet Archive.
Full-text of following books are also available in the Internet Archive. You may borrow and read them for a limited time. To request for your free account fill up this Request form.
Lancaster, Kelvin. Introduction to Modern Economics.
Bowles, S. Notes and Problems in Microeconomic Theory.