Dear Roba,
How Did That Happen?: Holding People Accountable for Results the Positive, Principled Way (Hardcover)
http://www.goodreads.com/book/show/6578835-how-did-that-happen
Managing People by Jane Weightman
http://books.google.com.eg/books/about/Managing_People.html?id=zForLtJwS0AC&redir_esc=y
Effective People Management
http://books.google.com.eg/books/about/Effective_People_Management.html?id=KyA57Qn1e1QC&redir_esc=y
Regards,
Hany Sewilam AbdelHamid
Business Development Manager