Digital Systems: principles and applications, 8th ed.
R. J. Tocci and N. S. Widmer.
Digital Electronics: principles, devices and applications.
A.K. Maini.
Fundamentals of Digital and Computer Design with VHDL
R. Sandige and M.L. Sandige
Logic and Computer Fundamentals
M. M. Mano and C. R. Kime