All:
Can anyone recommend good books on Trigonometrical Sums ? The only book I found is Vinogradov's book: Method of Trigonometrical Sums in the Theory of Numbers. but it is really old.
I am looking for a newer book, cover some recent progress in this area, (prefer easy to read).
You can try Trigonometric Sums in Number Theory and Analysis by Arkhipov, Chubarikov and Karatsuba