1. Milton Abramowitz & Irene A. Stegun, Handbook of Mathematical Functions, Nat. Bur. Standards, Appl. Math. Series No. 55, Washington, D. C., 1964.
2. Tom M. Apostol, Calculus, Vol. II, 2nd ed., Wiley, New York, 1969.
3. Undergraduate Texts in Mathematics;Apostol, Tom M.,1976
4. B. Baillaud & H. Bourget, Correspondence d’Hermite et de Stieltjes, Tome I, Gauthier-Villars, Paris, 1905.
5. The number of zeros for 𝜁^{(𝑘)}(𝑠);Berndt, Bruce C.;J. London Math. Soc. (2),1970