1. AMS-55, Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, U.S. Department of Commerce, National Bureau of Standards, Applied Mathematics Series-55, M. ABRAMOWITZ and I. A. STEGUN, Eds. Contains a wealth of information about gamma functions, incomplete gamma functions, exponential integrals, error functions, and related functions–Chapters 4 to 6.
2. The Gamma Function;ARTIN,1964
3. Tables of the Higher Mathematical Functions;DAVIS,1933
4. Mathematical Functions and Their Approximations;LUKE,1975