A small list of some books that may be of interest to you.

References for the Design Process
[1]	Salt, J.E. and Rothery, R., "Design for Electrical and Computer Engineers", John Wiley and Sons, 2002. ISBN 0-471-39146-8.
References for Circuits
[1]	Horowitz, P. and Hill, W., "The Art of Electronics", Cambridge University Press, 1989. ISBN 0-521-37095-7.