1. S. Abbott, Understanding Analysis, Springer, New York, 2001.
2. E. Asplund and L. Bungart, A First Course in Integration, Holt, Rinehart and Winston, New York, 1966.
3. R.G. Bartle, The Elements of Real Analysis, 2nd ed., Wiley, New York, 1976.
4. R.G. Bartle, The Elements of Integration and Lebesgue Measure, Wiley, New York, 1995; enlarged 2nd ed. of The Elements of Integration, Wiley, New York, 1966.
5. R.G. Bartle, A Modern Theory of Integration, Graduate Studies in Mathematics, Vol. 32, Amer. Math. Soc., Providence, 2001.