Most selling tech books are two "C" Language Books

The first is the Object Oriented Programming with C++' by E Balaguruswamy and 'Let us C solutions' by Yashwant P Kanetkar were considered the most selling books in the last month. "Let us C solutions" is contains of some problems in "C" programming language and its solution, while the other one consists with "C++" language in a detailed manner.

And the second most selling book is 'PMP - Project Management Professional Study guide' by- Josheph Phillips.