Here is a list of some important books that can be helpful.
all are free. Check these out.
Computer Networks(4th ed) by andrew S. Tanenbaum
A Textbook of Electrical Technology by B.L. Theraza
Data Communications and Networking 3ed by Forouzan
Digital Signal Processing by J.G. Proakis
Data and Computer Communications (5th ed) by William Stallings
Introductory Circuit Analysis by Boylestad
Electrical Engineering Dictionary
More free books here.
all are free. Check these out.
Computer Networks(4th ed) by andrew S. Tanenbaum
A Textbook of Electrical Technology by B.L. Theraza
Data Communications and Networking 3ed by Forouzan
Digital Signal Processing by J.G. Proakis
Data and Computer Communications (5th ed) by William Stallings
Introductory Circuit Analysis by Boylestad
Electrical Engineering Dictionary
More free books here.