For BA Economics Hons, for different subjects, different books are followed. So you should follow the books which are referred by your college professors. Now if you want to know about the must have books of BA Economics Hons then I am providing some of the name:

• N. Gregory Mankiw, Economics: Principles and Applications
• K. Sydsaeter and P. Hammond, Mathematics for Economic Analysis
• Richard T. Froyen, Macroeconomics
• C. Snyder and W. Nicholson, Fundamentals of Microeconomics
• Steven M. Sheffrin, Rational Expectations
• Richard J. Larsen and Morris L. Marx, An Introduction to Mathematical Statistics 11 and its Applications

To know more about Economics you may visit the link below:

https://www.careers360.com/courses/economics-course

I hope this answer helps. All the very best for your future endeavors!